Mac

This page lists questions and answers that were posted by visitors named Mac.

Questions

The following questions were asked by visitors named Mac.

A stone, which weighs 0.62kg, is thrown, at 5.5ms, its kinetic energy at its maximum height above the surface is 2.3J, what is the height of the stone at this point? Any eqautions or advice gratefully received. I assume that is 5.5 m/s, the initial veloci...

Hi, to calculate the GPP of an area, would I need to add the NPP and amount of respiration together? Hope this makes sense! http://en.wikipedia.org/wiki/Gross_Primary_Productivity

How do I find the empirical formula for aluminium selenide? You have to have some data, such as masses, or percent: Empirical means it was measured. The empirical formula for aluminium selenide is the same as it's molecular formula; Al2Se3. The empirical...

Need to write a balanced chemical equation for the reaction between hydrogen selenide and tin. I know that the hydrogen selenide decomposes producing solid tin selenide and hydrogen gas but how would I balance that in the equation. Any help gratefully rec...

I have to find the molecular formula for As2O3, to do so I have to divide its molecular mass by its empirical mass. I have worked ou that its molecular mass is 197.9 g/mol. How would I find its empirical mass, is it not the same as its molecular mass? Man...

Why does a hydrogen atom, which has only one electron, have so many spectral lines? Any help gratefully received. There are many energy levels the one electron can transition from/to.

A digital fsk equipment transmits bipolar return to zero data. when sending a sequence of alternating ones and zeros how many different frequenies will be transmitted? The fsk is actually sending mark and space signals, isn't it? The actual frequncies dep...

Determine the solution set to the equation: 2sin^2x+cosx-2=0

(1) Population: 250,000 Unemployed: 20,000 Labor Force Participation Rate: 80% (a) How many people are in the labor force? (b) What is the unemployment rate? (2) Not in the labor force: 125,000 Unemployed: 25,000 Employed: 100,000 What is the unemployment...

V pays 20 cents V sells to W for 35 cents W sells to X for 55 cents X sells to Y for 80 cents Y sells to Z for $1.00 Contribution to GDP: (a) 20 cents (b) $1.00 (c) $1.90 (d) $2.90

A decrease in aggregate demand will cause A. aggregate supply to fall according to classical economists, and prices to fall according to Keynes. B. prices to fall and unemployment to increase according to both classical economists and Keynes. C. prices to...

Please help! I need to factorise and solve this equation, x^2 +x -30 =0 I then need to explain how I would use the answer drom this to solve the equation 4x^2 +4x-120=0

calculate the amount of reactants required to produce 150g of H2O in CO2+H2O

How do I calculate finding the weight of someone, on the earth's surface with a radius of 3900 miles, and their weight 625ft above the surface?

1. When my teacher stopped [making reeds. Sending] all of her students on a wild goose chase. a. no change b. reeds. Thus sending c. reeds, she sent d. reeds, sending 2. They tend to take their time sending reeds to [you. I usually] have to wait a. no cha...

A river flows due east at 1.42 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.9 m/s due north relative to the water. If the river is 389 m wide, how far downstream is the boat when it reaches...

A box with a weight of 22N falls through the air with a wind resistance of 14N, what is the mass of the box and the acceleration of the box?

The ideas of _____ _____ are the basis for communism.

25 litre bottle of oxygen in a hospital. If the bottle is at 12 atmospheres, what volume of oxygen is available to the patient? If the oxygen is stored at 4 degrees C and used at 20 degrees, what difference does this make? (Assuming start volume and press...

A card is to be chosen at random from a shuffled deck. Find the probability the card drawn is A. The queen of clubs , given that it is an honor card B. a red four, given that the face number is even C. A seven, given that the face number is prime Please h...

Most of the asians who immigrated to the united states in the 1850s came because a.) Of available work b.) Of the rumor of a "golden mountain" in california" c.) they were forceds to flee due to collapes of the japanese economy d.) none of these

The solubility of compound A in ethanol is 0.5 g per 100 mL at 0oC and 5.0 g per 100 mL at 78oC. (a) To make a hot, saturated solution of 15.0 g of A at 78oC, how much ethanol is required? (b) When the solution prepared in is cooled to 0oC, how much of co...

1. Use the compound interest table to find the compound amount earned on a $5,900 deposit for 10 years at 10% compounded semiannually. _____________________________________ A. 9,610.45 b. 15,654.47 c. 3,710.45 d. 12,375.66 2. Megan deposited $6,000 in an...

The Romascos hope to have $2,000 in 3 years for a down payment on a new pool. They invest $1,000 in an account that pays 8% interest at the end of each year. Will they have enough money at the end of 3 years to meet their goal of a down payment? What is t...

Carly deposits $900 into an annuity at the end of every month for 2.5 years. The fund holds international stocks, and it yields about 12% compounded monthly. Find the interest earned after 2.5 years. a.$31,619.46 b.$31,306.40 c.$4,619.47 d.$4,306.40 (I ca...

4.5 moles of oxygen reacting with enough sodium will form how many moles of sodium oxide? How do you solve?

Where C = 46, D = 12, P = 11, Q = 37, R = 17, Y = 19 what numbers do T and S equal?

A 500 N weight is attached to a stiff rod of negligible weight that is hinged to one end. The rod is released from rest in horizontal position and allowed to swing freely in vertical arc. Through what angle with the horizontal must it swing to cause a ten...

Read the excerpt from the state constitution of Arkansas, which was adopted in 1874. No person who may hereafter fight a duel, assist in the same as second, or send, accept, or knowingly carry a challenge therefor, shall hold any office in the state, for...

What do you think the title, "The Great Gatsby," means? Is Gatsby “great”? Why or why not?

Ok, my question is ‘ last year the price of a certian computer was 150$ more than it is now. This year's price is 3/4 of last year's price. How much does the computer cost this year?‘. Can someone explain to me how to create an equation for this?

how did SC benefit from the war

A rectangular cardboard is 8cm long and 6cm wide.what is the least number of beads you can arrange on the board such that they are at least two of the beads that are less than √10cm apart? Please show step...

What is feedback?

In the excerpt from The Little Mermaid, what does the mermaid do with the prince after they arrive on the beach?

Use partial fraction to evaluate the following: (-2x+4)/(x^2+1)(x-1)^2

A firm is able to sell 84,000 items with the unit price of $30. If the firm increases the price to $32, the sales will drop 5,000 items Calculate the maximum unit price that the firm can set in order to have positive revenue

Answers

The following answers were posted by visitors named Mac.

How many people are in the labor force and what is the unemployment rate?

A. aggregate supply to fall according to classical economists, and prices to fall according to Keynes. B. prices to fall and unemployment to increase according to both classical economists and Keynes. C. prices to fall according to classical economists, a...

I understand Dr. Maurice hire a new nurse. What is his or her name?

I do believe that Van Hoff = 4 Kf(water) = 1.86 Molality = .0091 4*1.86*0.0091=delta T=.067704 0.00-.067704=-0.0677 degrees C is the answer on Millers quiz

Current area = 200m2 [10m x 20m] New area = 400m2 [10y x 20y] So, 400 = 200y2 So, y2= 2 So, y = 1.41 So, each side must be increased by a factor 0f 1.41 times. I this correct or do they mean add the same length to each side?

the answer is -log(10.6) dont forget the negative no, it doesn't make any sense to me, but i just did that same problem and that was the right answer

Slope of the given line is 2 , therefore the slope of the perpendicular line is -(1/2) Use your point slope equation y -y =m(x - x) Y - 4 = -(1/2)(x - 3) 2(y - 4) = -1(x - 3). You are looking a proportion and cross multiplying 2y - 8 = -1x + 3 2y. =. -1x...

Use your slope formula (-1 - 2.5) / (-.5 - 3) = -3.5/-3.5 = 1 Pick a point, does not matter which one, will get the same answer and use your point slope equation y - 2.5 = 1(x - 3) y = x - .5 y = x - (1/2)

C = 24D + .75M C = 24(7) + .75(463) C = 168 + 347.25 C= 515.25

19). 4sin^2x/cos^2x - cos^2x/cos^2x 4(1-cos^2x) - cos^2x. All over cos^2x 4 - 4cos^2x - cos^2x. All over cos^2x 4 - 5cos^2x. All over cos^2x 4/cos^2x - 5

20). Sin^2x - sin x / cos x (1-cos^2x)cos x - sin x. All over cos x Cos x - cos^3x - sin x. All over cos x

21). Factor the numerator and the denominator (Sin x - 3)(sin x - 3) / (sin x - 3)(sin x + 3)

17). Multiply numerator and denominator by Sin x + 1 The numerator ( sin x + 1)(sin x -1) = sin ^2x -1 = -1(1 - sin^2x) = -cos^2x

18). Factor perfect square ( sin ^2x + cos^2x)^2 = 1^2=1

Cos (cos/sin)= cos^2/sin = (1 - sin^2x)/sin 1/sin sin^2/sin = csc x sin x

It is the definition of a parallelogram

(50 miles x 5280 feet x 1 hour x 1 minute) / (1 hour x 1 mile x 60 minutes x 60 seconds)= 73 feet per second

Flip it X^2/ (3/2)

Equation of a line that divides the first and third quadrants in half Being 6 th grade it could be the beginning of function If x = 1 , then y = 1 If x= 2 , then y = 2

Not sure what you are asking for There is only one point (0,0) that contains all 5 circles

. 88(150)+.94(150)+.90(150)+x(250)=.93(700) 132+141+135+x(250)=651 408+x(250)=651 x(250)=243 x=.972 Or you need 243points to earn a 97.2 percent

11) correct 12) correct 13) correct 14) correct 15) if it is 15% off ,then the sale price is 100 -15 or 85% If it is 25% off, the sale price is 75% 16) your are asking for the FINAL balance not finding the interest

17) .07 times 22.00 will give you the amount of tax on the shirt That should get you going 18) difference / start 2000 to 2001. Would be (3640-3250)/3250 or 12% That should get you going

16) you are given 730...so add the interest to it 15) correct

It is difference divided by start So now you need to take the 390 and divide by 3250 And take the 450 and divide by 3640 390 and 450 are the amount of increase not the percent of increase

20 - input 20 - 0=20 20 - 2=18 20 - 4 =16 f(n)=20-n

.12 or 12% .126 or 12.6%

Factor What factors multiply to equal 56 and subtract to equal 1?

if your zeros are 5and8, then you say: X=5 and x=8 x-5=0 and x-8=0 (X-5)(x-8)=0

Yes (X-7)(x+8) Check by foiling X^2 +8x -7x -56 X^2 +x -56

Get a common denominator If you have a/6 and b/6 and c/6, then a:b:c would be the ratio and a+b+c=6

It does not matter how large your numbers are,just follow the pattern

Looks fine to me d/dx sec x = (sec x tan x)(der of x)

I would use 2x as the with and have the radius of the circle be x. Your h would equal (1/2)(52-2x-3.14x) I think the x and h should be closer The closer the numbers, the max the area

Yes you factor 3k(k-5)(k+3) and your check says you did it correctly Now to find the zeros Set each factor = 0. And solve 3k=0. K=0 K-5=0. K=5 K+3=0. K=-3

Find the der of f(x) Then substitute 2 into the der of f(x)

Q = 11 + D 25Q + 10D = 765

40(base)=(1/2)(base)(height) 80(base)=(base)(height) Divide by base and they both drop out 80=height

Tan78.2=h/x. h=x(tan78.2) Tan17.6=h/(x+10). h=(x+10)(tan17.6) Need to solve for x and then go back for your height.

40625/100000 Reduce 40625=5^5 times 13 100000=5^5 times 2^5

8x+5y=200 X=length of one rectangle Y=width of one rectangle Area = xy Y= (200-8x)/5 Area=x (200-8x)/5 Hope this gets you going

You will get the same answer The extra would be putting your answer in lowest terms 6/9 + 4/9 = 10/9 12/18 + 8/18= 20/18 = 10/9

Parallel means same slope M=-1/3 Point(-4,3) Plug into y=mx+b and find b 3=(-1/3)(-4)+b You should be able to finish from there

Find f(1) and f(2) Find the slope f(1) - f(2) / 1 - 2 Write your equation Rate of change = slope

C= 3a 3c + 7a = 46000

D=4n-1 (1/3)less than (n/d) less than (1/5) (1/3) less than(n/(4n-1)) less than (1/5) Solve the between statement

6y-6 Distributive property

Tan32=h/x Tan22=h/(x+80) (Tan32)(x)=(tan22)(x+80) Solve for x and then for h

This graph is a v shape with vertex at (0,0) with a ray in the first quad with slope 1 and a ray in the second quad with slope -1 The +1 sends this graph up one It does not change the curve. The -flip the v downward The 3 changes the curve. Instead of the...

-7(3)^(6-1) Or -7, -7(3), -7(3)(3), -7(3)(3)(3), -7(3)(3)(3)(3), -7(3)(3)(3)(3)(3)

(X)+(3x)+(5x)=27

Distance is equal to rate times time Therefore time is equal to distance divided by rate. 1586/39= 40 2/3 hours That means it takes 40 2/3 hours to go 1586 km when you are going 39 km per hour So if you start at 10:30 and go for 40 and 2/3 hours, which is...

Khan , I think your units are off 40.6666 .... Hours The rate is km per hour 1586 km / ( 39 km/1hour) = 1586 km x (1 hour/ 39 km) Km drops and your left with hours Not sure where the days come in except 40 hours is short of 2 days

X=width X+4= length X(x+4)=60 You will be factoring

You first have to find your rate .75 = e^ (r)(10) Then find the time for half- life .5 = e^ (r from above)(t)

In a rectangle diagonals are equal Set the two equal to each other and solve

1 correct 2 correct 3 correct 4 correct

Mid segment=1/2 the sum of the bases LM=(1/2)(46+125)

That is what I get

6x+16=49 6x=49-16=33 X=33/6=5.5

Rate of change is 2 because you have a line the rate of change (slope) is constant

A). (7x+ 4)/(7x-8) Domain is all except x can not equal 8/7 because it will make the denominator equal to 0 B). ( 5x + 4)/ 2x Domain all except x can not equal 0

5000(1+ .055/2)^(2)(5)

U-shape turned downward and moved to the left 2 units Inside the() moves left or right opposite the sign Outside the () moves up or down same as the sign The negative flips the curve

Venn diagram 256-78-116

Use your rules of logs Log a^(1/3) - log b^3 Log (a^(1/3)) / (b^3)

A) .98(210) and .98(240) B) (210)(240) (.98)(210)(.98)(240) Percent decrease = diff in your two answer/ original (210)(240)

Tan30= h/p Tan45=h/q p + q= 100 Use substitution (h/tan30) + (h/ tan45 )= 100 You should be able to take over

Point of inflection I agree with you

Venn diagram problem I phone only. 70 Cars only. 10 Both. 60 Neither 60 Total 200 Hope this will help you

Permutation You have 210 objects taken 1 at a time

A) log 6a / log 6a B)5(log 9b/ log 9b) B should help you with C

Group two by two X^2(x-3)+16(x-3) (X-3)(x^2+16) For zeros X-3=0 X=3 X^2+16=0 X^2=-16 X=+or- 4i

Get you started you have to start by guessing X=3 works Then do long division Answer will be x^2+12x+36 Factor (X+6)(x+6) 3and -6 are your critical values Now you have to test the different regions

Venn diagram problem P only=33-18-x B only =26-17-x C only =25-19-x 15-x+9-x+6-x+8+10+9+x=63 -2x=63 X=-3 Which means you have to work with 3 in the middle

Just pick a number in the region Plug back into the function Neg ans means less than 0 Pos ans means greater than 0

Thanks. Also noted that V2 would only be 275 as once the pressure in the bottle reaches 1atm, the volume inside would be 25litres. So only 275litres are available.

The wavelengths are shorter in this region

well i've only got what my paper gives me. but i'd assume it is talking about chinese, considering those were the main asian immigrants at the time

or maybe japanese, since that's in one of the answers

R=(G*mp*T^2/(4*pi^2))^(1/3) Vesc=sqrt(2*mp*G/R)

390 is for a deccelaration of 4 and not of 7.the right answer is 195

(a) Set up two equations. One for forces, one for torques. For the first equation, which way does friction act? i.e. which way would the yoyo move if there was slip? Since there is no slip, friction must be acting *against* the intended direction of motio...

Thank you so much for explaining that! I wasn't getting that answer at all, but I do see ho you get it. Thank you again!

Your answer is wrong. You forgot to switch csc into sin, therefore r=3, and s=5. Now we know that tan (T)= 4/3

He was wearing a football jersey and was talking about yardage gained or lost and what yard line the players ended up on.

The answer is radical 55 divided by the square root of x. ur wlcom. thx

You could use potassium nitrate to test for potassium because both potassium and nitrate are water soluble. Potassium nitrate will react with the fluoride and create a solid precipitate. Potassium nitrate is water soluble.

8(2x-3)-6x if x=3