Marrion

Help! I've tried this question and i don't come to a correct answer! The value of a property depreciated by 3.25% between 1997 to 2004, and appreciated by 2.75% between 2005 to 2008. In 1997, the value of the property was $75000, find its value in 2008. M...

16 years ago

The size of a country on a map with scale of 1:50000 is reflected as 2730.8cm^2, and the coastline is reflected as 386cm. The size of the country when drawn on another map with different scale, is 10923.2cm^2. Find the length of coastline reflected on the...

16 years ago

Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b in terms of sinx and cosx. I don't know what i'm supposed to do, and i don't come to an answer! Help, thanks! my workings: tan(45+x)= (1+tanx)/(1-tanx) a/b = (1+tanx)/(1-tanx) a(1-tanx)=b(1...

16 years ago

How should i integrate (4cos^2 - 1)? Do I use a certain formula??

16 years ago

Find the values of b and c for which x^2+bx+c is a factor of 2x^3-3x^2-3x-5 Ok, i've tried to find a factor of the quadratic function using trial and error. Let f(x) = 2x^3-3x^2-3x-5 f(1) is not equals to 0 f(-1) is not equals to 0 ... and i cant find a n...

16 years ago

A circle has the equation x^2+y^2-4x+6y-12=0 and i have already found that the centre has a coordinate of (2,-3), and a radius of 5 units. But i need to find points on the circle that has the gradient of -4/3 when a tangent is drawn on the point. How do i...

16 years ago

Given that (2^3x) x (7^2x) = 7^(x-1) x 2^(2x+2), find 14^x without using a calculator.

16 years ago

Question: Given that (2^3x) x (7^2x) = 7^(x-1) x 2^(2x+2), find 14^x without using a calculator.

16 years ago

This is the question: "Find the values of b and c for which x^2+bx+c is a factor of 2x^3-3x^2-3x-5." I was suggested to use long division, but how do i do long division when i don't know what b and c are??

16 years ago

i'm studying A Midsummer Night's Dream, and i am a bit confused about the marriage of Theseus and Hippolyta. Please help! In act 1 scene 1, Theseus said "Hippolyta, i wooed thee with my sword and won thy love doing thee injuries". The modern translation o...

16 years ago

A 0.1mol/dm^3 aqueous solution of phosphoric (V) acid, H3PO4, is mixed with a 0.1 mol/dm^3 of aqueous solution of sodium hydroxide. Which mixture will form the salt Na3PO4? a) 10cm^3 of H3PO4 with 30cm^3 of NaOH b) 10cm^3 of H3PO4 with 10cm^3 of NaOH c) 2...

16 years ago

elements x and y are from group 7 in the periodic table. x is a liquid at rtp, while y is a solid at rtp. which statements are correct? 1) atoms of y have more protons than atoms of x 2) molecules of y have more atoms than molecules of x 3) y displaces x...

16 years ago

In which reaction does the smallest percentage change in volume occur? a) C3H8 (g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) b) 4NH3(g) + 3O2(g) ----> 2N2(g) + 6H2O(l) c) CH4(g)+ 2O2(g) ----> CO2(g) + 2H2O(l) d) 2H2S(g) + SO2 (g) ----> 3S(s) + 2H2O(l) The correct a...

16 years ago

What is the role of bacteria in the making of yoghurt from milk? 1. to make alcohol 2. to make carbon dioxide 3. to make lactic acid 4. to make lactose coagulate I think the answer is number 4, but i'm not so sure.

16 years ago

I'd like to know, how many chromosomes are there for humans? (Correct me if i'm wrong) There are altogether 46 chromosomes, (or 23 pairs of chromosomes), which includes a pair of sex chromosomes.

16 years ago

The female mosquito is an effective vector for malaria. What makes it an effective vector? 1. it has wings 2. it lays many eggs 3. it makes noticeable noise 4. it mates several times I wrote the answer as B, but the answer as told on my assessment book sa...

16 years ago

Inorganic fertiliser is applied each year to fields bordering a lake. the fertiliser runs off into the lake and causes six changes which altogether make the fish die. 1. aerobic bacteria feed on dead plants 2. algae reproduce faster 3. light cannot penetr...

16 years ago

If i do a starch test on a plant cell that comes from a plant exposed to sunlight, which parts of the plant cell will be stained blueblack? 1. nucleus 2. cell wall 3. cytoplasm 4. vacuole I wrote the answer as 4, the vacuole, but the correct answer says 3...

16 years ago

Which method of birth control prevents the implantation of the fertilised egg? 1. coil (mechanical) 2. condom (mechanical) 3. spermicide (chemical) 4. vasectomy (surgical) I don't get the question. The correct answer was number 1, but shouldn't all the op...

16 years ago

Which blood vessel contains blood that has high oxygen concentration, low carbon dioxide concentration, and high pressure? 1. aorta 2. pulmonary artery 3. pulmonary vein 4. vena cava I wrote the answer as 3, but is wrong. Which one is the correct answer?

16 years ago

Which is the most direct way that the carbon in starch stored in cereal grain can be released to the atmosphere as carbon dioxide? 1. grain destroyed by fire 2. grain eaten by birds 3. grain made into bread and eaten by humans 4. grain stored in damp cond...

16 years ago

What is the percentage of oxygen in expired air when a person is resting?

16 years ago

A variety of snail has an inherited condition that affects the thickness of the shell. The alleles are t and n. tt have thick shells tn have thin shells nn do not survive Two heterozygous snails are mated. What is the probability that a surviving snail of...

16 years ago

A person has the blood group AB, what determines this blood group? a) different alleles on different chromosomes b) different alleles on the same chromosomes c) the same alleles on different chromosomes d) the same allele on the same chromosomes I thought...

15 years ago

Does Sodium and potassium react with steam? Or is the reaction too violent to speak of?

15 years ago

How do i combine 2 half ionic equations into an overall equation?? 4OHˉ → 2H2O + O2 + 4e 2H+ + 2e → H2 *The "H+" is the hydrogen ion The correct overall equation is 2H2O → 2H2 + O2 How do i get that???

15 years ago

1. Urea is made where? Is it in the kidneys or the liver? 2. Which trophic level gets the least amount of energy? a) producers b) herbivores c) carnivores d) decomposers I think the answer is c, but i'm not sure if it's right.

15 years ago

Please check my workings to see if i'm correct, thanks! Find the percentage of nitrogen by mass in Ammonium nitrate, NH4NO3. (28/80)x 100% = 35% Is my answer correct?

15 years ago

Which trophic level gets the least amount of energy? a) producers b) herbivores c) carnivores d) decomposers I think the answer is c, but i'm not sure if it's right. I posted this question earlier, but google didn't provide with an answer. I still think t...

15 years ago

Which reactants could be used safely to prepare potassium chloride? 1. aqueous potassium hydroxide and dilute hydrochloric acid 2. aqueous potassium sulphate and aqueous sodium chloride 3. potassium and aqueous sodium chloride The answer is 1, but i don't...

15 years ago

Please help me, i don't know how to approach this question! All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? a)0.5 mol of (NH4)3PO4 b)0.5 mol of (NH4)2SO4 c)1 m...

15 years ago

I posted a question earlier, and i'm still abit confused. What is the reaction between potassium and aqueous sodium chloride? I was told that the products are KOH, H2, and KCl. But shouldn't the reaction be a displacement reaction? Since Potassium is more...

15 years ago

I read on the textbook a sentence like this: "The melting and boiling points of alkanes increase as their molecular sizes increase. This is because as alkane molecules become bigger, the attractive forces between the alkane molecules become stronger." Ple...

15 years ago

Sorry i know how to do this already.

16 years ago

You factorize the quadratic funtion on the left. x²-7x+10>0 (x-2)(x-5)>0 So the answer should be: x<2 OR x>5

16 years ago

Dont use a calculator. Just multiply the numerators together and the denominators together. You should get -234/64800

16 years ago

You mean factorize? bring out 5 from both sides. It's the highest common factor of both sides: 5(9c+5d)

16 years ago

correct.

16 years ago

yes, 3

16 years ago

1) (x+5)(3x-3) 2) 3x(x-1)

16 years ago

what's your question?

16 years ago

ok, the general equation of a line is y=mx+c, with m being the gradient, and the c being the y-intercept. so you already know that the line would be y=-4x+c. They told you a point on the line, so you subt that in. With x being -6, and y being 7. So, you s...

16 years ago

I answered your previous question, and i think you should understand... but, anyways, you should know that all straight lines have the general equation y=mx+c. M being the slope/gradient, and c being the point at which the line cuts the y axis, also known...

16 years ago

I see! Thanks!

16 years ago

alright, i found the answer already.

16 years ago

sorry i submitted the question twice i think .

16 years ago

= 3 = When jellyfish reach adulthood they are about 95% water, so they are about the same density as water. That's why they float. Hope that's the answer you're looking for. :)

16 years ago

thanks

16 years ago

thanks

16 years ago

sorry! There's a mistake. the four choices are: 1. nucleus 2. cell wall 3. chloroplast 4. vacuole So which one is the correct option?

16 years ago

You mean "v" is an unknown? You cant solve an unknown without an equation.

15 years ago