Questions and answers by

Dave

Questions (508)

Solve the integral of (x*e^2x)/(1+2x)^2 by first using u substitution and then use integration by parts.I am very confused on
1. 3 answers
2. 719 views
What is traveling faster, an x-ray wave or a radio wave?The question is so general, so how am I suppose to figure it out without
1. 1 answer
2. 555 views
A 10.0000 g block of aluminum is heated and placed in a stream of oxygen gas, resulting in the formation of aluminum oxide on
1. 2 answers
2. 739 views
A 10.0000 g block of aluminum is heated and placed in a stream of oxygen gas, resulting in the formation of aluminum oxide on
1. 2 answers
2. 705 views
Evaluate the integral of 1/(1+sqrtx)^4 from [0,1]I started off letting u=1+sqrtx and du=1/2sqrtx, but then there is no 1/2sqrtx
1. 1 answer
2. 608 views
Evaluate the integral of (e^z + 1)/(e^z + z) from [0, 1]How do you know what to let equal to u to start this process? The answer
1. 1 answer
2. 419 views
Evaluate the integral of x * sqrt(x-1) from [1,2].I let u=x-1 and du=1*dx, but then I can't get rid of the x to start
1. 1 answer
2. 416 views
Evaluate the integral of (x^3 + x^4*tanx) from [-pi/4, pi/4]How do we know which one to let equal to u in order to start this
1. 1 answer
2. 400 views
Evaluate the integral of e^(1/x) / x^2 from [1,2].I let u =1/x, but then I am stuck because I am not sure what is the derivative
1. 1 answer
2. 441 views
Evaluate the integral of x*(2x+5)^8*dxI let u=2x+5 and du=2*dx, but then where do I go from there because I can't get rid of the
1. 1 answer
2. 566 views
Evaluate the integral of (sin 2x)/(1+cos^2 x)1. u=cosx and du=-sinx *dx 2. evaluate the integral of -1/(1+u^2)*du 3. result is
1. 1 answer
2. 694 views
Evaluate the integral of 5^t * sin (5^t) *dtI started out with u = 5^t , but then I got stuck on du because I am not sure how to
1. 1 answer
2. 1,360 views
Evaluate the integral of(secx)^2 * (tanx)^3 *dx I started out with letting u=secx and du=secx*tanx*dx , but then I am kind of
1. 1 answer
2. 783 views
Use the appropriate reciprocal identity to find the approximate value of sin θ for the given value of csc θ. Use a calculator.
1. 1 answer
2. 4,228 views
A runner is jogging at a steady 3.9 km/hr.When the runner is 7.4 km from the finish line, a bird begins flying from the runner
1. 1 answer
2. 905 views
To edit the text in a smartart graphic, what must be done first ?
1. 7 answers
2. 2,152 views
1. Why is it important to learn about parenting?2. To what extent does the average person know about child development and
1. 1 answer
2. 766 views
the point (3,-4,5), (1,0,5), and (3,1,-2) are three out of four vertices of a parallelogram ABCD. Explain why there are three
1. 1 answer
2. 593 views
How do you solvesin x * cos x = 1/4 I don't know where to start.
1. 1 answer
2. 512 views
Given that $x^n - \frac1{x^n}$ is expressible as a polynomial in $x - \frac1x$ with real coefficients only if $n$ is an odd
1. 1 answer
2. 762 views
The force Fa=(5i+6j+1k) is applied on a material point while it is shifted by 50m in Oxy plane along a direction 20o CCW versus
1. 1 answer
2. 491 views
I do not understand this problem.This is part of the question, but I think if I get this part, I'll get the rest. Determine the
1. 7 answers
2. 645 views
"When the war ended in 1945, two-thirds of all American men between the ages of 18 and 34 were in uniform. Experts feared that
1. 8 answers
2. 2,342 views
Which of the following helped women in the workplace?A the Civil Rights Act of 1964 B the Voting Rights Act of 1965 C the end of
1. 7 answers
2. 2,419 views
Nitrogen monoxide reacts with chlorine gas according to the reaction:2NO (g) + Cl2 (g) â‡” 2NOCl (g) Kp = 0.27 at 700 K A
1. 1 answer
2. 2,450 views
Amy leaves home at the same time every morning and gets to school exactly at 8 AM. If she traveled at 70 meters per minute she
1. 1 answer
2. 622 views
Which of the following was the main contributor to finally bringing the United States out of the Great Depression?A the National
1. 23 answers
2. 5,403 views
The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the x-axis. Find the volume of the solid
1. 1 answer
2. 1,674 views
1. Which of the following apply to fascism? Select all that apply.A rooted in militarism B extreme nationalism C respect for
1. 39 answers
2. 22,335 views
Fido weighs 26 pounds more than Fifi. Fifi weighs 12 pounds less than Rover. If the sum of their weights is 71, how much does
1. 5 answers
2. 11,112 views
A basket ball team scored a total of 160 points. they made 74 baskets. how many 2 point and how many 3 point shots?
1. 1 answer
2. 473 views
If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x,
1. 1 answer
2. 530 views
Suppose you titrated a sample of sulfuric acid (diprotic acid) with a 0.250 M solution of NaOH. Given the data in the table
1. 2 answers
2. 3,345 views
f(x) = cos(x) + 3xFind f^-1 (1) and (f^-1)' (1) f^-1 (1) = 0 (f^-1)' (1) = 1/3 These are the answers given, but I also don't
1. 1 answer
2. 400 views
f(x) = x^5 + 2x^3 + x - 1Find f^-1 (3) and (f^-1)' (3) f^-1 (3) = 1 (f^-1)' (3) = 1/12 Those are the answers, but I have no clue
1. 5 answers
2. 410 views
lim 200 (30-t)^2h->0 t=10 The answer should be -8000, but I keep getting -80,000 because I have to do it the long way.
1. 1 answer
2. 332 views
There is a graph of a function that looks like y = x^4 , but it has a vertical asymptote at x = -2 and x = 4.The question then
1. 1 answer
2. 484 views
Is the step function differentiable in its domain?I answered it and said that the step function is not differentiable in its
1. 1 answer
2. 746 views
Find the 999th derivative of cos x.I got sin x.
1. 1 answer
2. 6,682 views
lim (cos(π/4 + h) - cos (π/4))h->0 _________________________ h Somehow I ended up with cos(1).
1. 2 answers
2. 534 views
Use the quotient rule to find the derivative of cot x.I tried to solve this, but somehow I got (sec^2x)/(tanx)^2.
1. 1 answer
2. 514 views
find the lcm for 6, 18
1. 1 answer
2. 335 views
What kind of scenes did artists who gained fame tend to paint in the late eighteenth century. Give an example.
1. 0 answers
2. 425 views
What kind of scenes did artists who gained fame tend to paint in the late eighteenth century. Give an example.
1. 0 answers
2. 460 views
your derivative is correct.now just plug in x = π/2 to get the slope remember that tan(π/2) is undefined, BUT cot (π/2) =
1. 1 answer
2. 555 views
Find the inverse of:y = ((-1) / (x+5)) - 1
1. 1 answer
2. 341 views
your derivative is correct.now just plug in x = π/2 to get the slope remember that tan(π/2) is undefined, BUT cot (π/2) =
1. 0 answers
2. 544 views
Find an equation for the tangent line to the curve at (π/2 , 2).y = 4 + cot(x) - 2csc(x) I am confused how to take the
1. 2 answers
2. 801 views
Find 2 tangent line equations to the curve y=x^3+x at the points where the slope of the curve is 4.What is the smallest possible
1. 1 answer
2. 762 views
lim as x approaches negative infinity(3x^5 + 6x + - 3) / (8x^4 + 10) a. Does Not Exist b. 0 c. -3/8 d. 3/8 I solved this and got
1. 1 answer
2. 382 views
lim as x approaches negative infinity(3x^5 + 6x + - 3) / (8x^4 + 10) a. Does Not Exist b. 0 c. -3/8 d. 3/8 I solved this and got
1. 1 answer
2. 405 views
Construct a function f : R2 ¡æ R such that its saddle points are given by {(n, 2m+1−n)|n ¡ô Z, m ¡ô Z}, where Z is the
1. 1 answer
2. 462 views
The limit as x approaches negative infinity is(3x^5 + x + 2) / (8x^4 - 5) a. DNE b. 0 c. -3/8 d. 3/8 I think the answer is
1. 2 answers
2. 426 views
They systematic raiding of the Athapascans shows that organized warfare is most clearly identified with:a. there is no record of
1. 3 answers
2. 712 views
The map of northeastern region of North America shows the tribes of the Iroquois Confederacy:a. in a staked formation south of
1. 1 answer
2. 640 views
Teotihuacan like other early urban civilizations wasa. self sustaining and unconcerned with long distance trade as a result of
1. 2 answers
2. 651 views
They systematic raiding of the Athapascans shows that organized warfare is most clearly identified with:a. there is no record of
1. 0 answers
2. 637 views
I have a wheel 40 cm diameter that has 200 N m of torque, assuming there is no slippage what would the force of the wheel on the
1. 1 answer
2. 407 views
To become a law, typically a bill must be approved by:a. The House of Representatives, the Senate, and the President b. The
1. 1 answer
2. 577 views
To become a law, typically a bill must be approved by:a. The House of Representatives, the Senate, and the President b. The
1. 1 answer
2. 615 views
What limits the amount of legal immigrants to our country?a. Tariffs b. Census c. Quotas d. Passports I couldn't find this
1. 3 answers
2. 665 views
Which of the following is NOT part of the naturalization process?a. Filing a Declaration of Intention b. Taking a US history,
1. 10 answers
2. 2,376 views
Our rights are sometimes restricted in order to protect:a. those that are offended easily b. health, safety, and moral standards
1. 5 answers
2. 489 views
To become a law, typically a bill must be approved by:a. The House of Representatives, the Senate, and the President b. The
1. 1 answer
2. 541 views
A pharmaceutical salesperson receives a monthly salary of $2500 plus a commission of 7 percent of sales. Write a linear equation
1. 1 answer
2. 1,074 views
The worker pushes with a force of 10 N that points downward at an angle of 45° below the horizontal. What component of the
1. 1 answer
2. 869 views
a geometric progression has a third term of 20 and a sum to infinity which is three times the first term. find the first term
1. 1 answer
2. 4,734 views
a sum to infinity which is three times the first term. find the first term
1. 1 answer
2. 834 views
Use Simpson's rule with n = 4 to approximate. Keep at least 2 decimal places accuracy.Integrate: (cos(x))/(x) x=1 to 5
1. 1 answer
2. 2,162 views
A sample of water is known to contain 1.51 × 10^24 H2O molecules. How many moles of H2O molecules are present in the sample?
1. 1 answer
2. 1,343 views
How do I Factor the expressiona y - a^{6} y^{6} ?
1. 2 answers
2. 394 views
What type of orbitals are used to form the N–N bond in hydrazine, N2H4?
1. 2 answers
2. 668 views
What set of hybrid orbitals is used by Xe in XeO3F2?dsp2 d2sp3 sp3 dsp3 d2sp
1. 1 answer
2. 1,209 views
Of 450 lunches old at school on Thursday, 40% were hamburgers and the rest were pizza. How many more pizza lunches were sold
1. 3 answers
2. 945 views
a 12-ft-long guy wire is attached to a telephone pole 10.5 ft from the too of the pole. If the water forms a 52 degree angle
1. 2 answers
2. 975 views
Can somebody show or explain this to me:Change 6 2/3% to fraction and .6 1/3 to a decimal or fraction.
1. 1 answer
2. 619 views
Celeste just borrowed 47,500 dollars. She plans to repay this loan by making equal quarterly payments of 3,126.28 dollars for 19
1. 1 answer
2. 540 views
Lim sin(60-x)/2cosx-1 x approaches 60
1. 2 answers
2. 1,017 views
What is the percentage chance that the same number can be pulled twice when there are 12 numbers in a hopper? If the number that
1. 1 answer
2. 394 views
A brick is initially 12.90 cm high and an aluminum can is initially 12.91 cm high. By how much must their temperatures be raised
1. 0 answers
2. 542 views
A 1.05 liter flask contains a certain quantity of ideal gas at 305 K. Then an equal number of molecules of the same gas is added
1. 0 answers
2. 601 views
By how much does the air pressure in a house increase if the house is sealed and the air temperature increases from 10.7° C to
1. 0 answers
2. 459 views
Find the volume occupied by 3.14 moles of an ideal gas at standard conditions of pressure and temperature (P = 1.00 atm, T = 273
1. 1 answer
2. 502 views
A watertight car is submerged under water. What force is required to open a door of area 1.12 m2 if the average depth of water
1. 1 answer
2. 696 views
A certain concrete will support a maximum compressive stress of 1.30 107 N/m2 before being crushed. A column of uniform width is
1. 1 answer
2. 959 views
A man doing a slow push-up is approximately in static equilibrium. His body is horizontal, with his weight of 750 N supported by
1. 1 answer
2. 590 views
Gloria would like to construct a box with volume of exactly 45ft^3 using only metal and wood. The metal costs $15/ft^2 and the
1. 3 answers
2. 4,525 views
The above function is given:f(x)= sqrt of (2x-6)/(x-8) - Sarah describes the domain as [3, ∞). - Describe why her domain is
1. 3 answers
2. 1,001 views
I need some help with my maths questions please!What angle does the tangent to the curve y=x^4-x^3+7x make with the positive
1. 1 answer
2. 701 views
Find x1) x^2*23y^2 = 1.78x10^32*z 2) 1.3*10^-4 x=4.7/x -6.3*10^-3 Please help
1. 2 answers
2. 417 views
if 1.37 moles of Pb(NO3)2 is mixed with 2.56 moles of KI, how many moles of PbI2 are produced?
1. 1 answer
2. 575 views
Find the area of a triangle with base of 15 m and altitude of 12 m
1. 1 answer
2. 554 views
A cubical Gaussian surface surrounds three positive charges, each has a charge q1 = +4.00 × 10-12 C, and two negative charges,
1. 1 answer
2. 2,111 views
Find r in a geometric sequence if A=2 and A10=1024
1. 1 answer
2. 688 views
I have 59.73 grams of a solid dissolved into water. The total is now 115ML of water. I added the water into a beaker already
1. 2 answers
2. 539 views
What is the molarity of a bleach solution containing 6.6 g of NaOCl per liter of bleach?answer please
1. 1 answer
2. 845 views
How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 111.0 mL of 0.36 M H2SO4?
1. 1 answer
2. 921 views
A ray of light traveling in air strikes the midpoint of one face of an equiangular glass prism (n = 1.74) at an angle of exactly
1. 1 answer
2. 1,133 views
What is the mass of a child if the force of gravity on the child's body is 100 N?A. 9.8 kg B. 4.45 kg C. 22.5 kg D. 10.2 kg
1. 2 answers
2. 551 views
If a tank contains water 4 m deep, what is the pressure at the bottom of the tank? (Neglect the atmospheric pressure.)A. 39.2
1. 2 answers
2. 1,161 views