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the answer is 4

both are incorrect, but thanks for your help. maybe something is wrong with this question. 

0.001929

0.0019

I believe the answer is 3.6, if not I don't know what I did wrong then.

Thank you now I understand it better but still why is it give me 6

it's the left

No I mean two decimal places to the left or right

Sorry, that's all the infomation I was given. I tried different answers but they all were wrong.

If you want me to help I am going to need a little bit more information.

This is actually the formula for finding the area of a triangle. So A=1/2bh is actually Area-.5(base x height).

0.875

7 divided by 8

7.3590540323720918

I love how you answered your own question. xD

The answer is 4

42

jk 21

(5a)²x 21a=4200

$$\begin{array}{rcl}
(5a)^2\cdot 21\cdot a &=& 4200 \\
(5a)^2\cdot 21\cdot a &=& 2\cdot 21 \cdot 100\\
(5a)^2 \cdot a &=& 2 \cdot 100 \quad | \quad \sqrt{}\\\\
5a \cdot a^{\frac{1}{2}} &=& 2^{\frac{1}{2} }*10 \quad | \quad :5 \\
a^1 \cdot a^{\frac{1}{2}} &=& 2^{\frac{1}{2} }*2^1 \\
a^{\frac{3}{2}} &=& 2^{\frac{3}{2} } \quad | \quad ()^{\frac{2}{3}}\\
a &=& 2
\end{array}$$

7.3590540323720918

There is no answer to this question because you never told us the value for x and y.

Randy has 4 pennies, 2 nickels , and 3 dimes in his pocket. if he randomly chooses 2 coins, what is the probability that both are dimes ?

By the first choice we have 3 dimes of 9 coins = $$\dfrac{3}{9}$$

By the second choice we have 2 dimes of 8 coins = $$\dfrac{2}{8}$$

The probability is $$\dfrac{3}{9}\cdot\dfrac{2}{8} = \dfrac{1}{12} = 0.08\overline{3}$$

(5a)^2 * 21a  = 4200

25a^2 * 21a  = 4200

525 a^3  = 4200   divide by 525 on both sides

a^3  = 4200/ 525 = 8     take the cube root of both sides

a = 2

I was doing my research and I found out you could do base * height to make it easier.

Area = (1/2) d₁ * d₂     ...  where d₁ and d₂ are the diagonals

We have

tan 12.5  = 60 / adj       rearrange  as

adj = 60 / tan 12.5  = about 270.64 m

In my old school I learned a few rules to simplifing fractions.

Reminder: YOU NEED TO DIVIDE THE NUMERATOR (TOP) AND THE DENOMINATOR (BOTTOM) PARTS OF THE FRACTION BY THE SAME NUMBERS!

If the fraction ends with an even number on both the numerator and denominater, you can keep dividing by two until you can't go anymore. If the fraction on the numerator add up to something you can divide by three, you can divide the fraction by three (this has to work on the denominator too). For fours, it just has to be something divisible by four. If the numerator and denominator both end in a five or zero, you can divide it by five. If you have a six, do the same thing you did as three. Sevens, you have to find that one yourself because I never learned that one. Eights are the same way, you're going to have to find it. Nines are different, the number just has to be able to divide by nine. Finally, tens need to end in a zero to work.

We have an angle, a hypotenuse - the ladder length - and we're looking for the opposite side......the sine seems the way to go, here.....

sin 65 = opp / 20   multiply both sides by 20

20 sin 65 = opp = about 18.13 ft up the wall