All Answers 358088 Answers

$${\mathtt{78}}{\mathtt{\,\times\,}}{\mathtt{500}} = {\mathtt{39\,000}}$$

A way you can do problems like this in your head is doubling one number and halving the other.

Ex:

$${\mathtt{500}}{\mathtt{\,\times\,}}{\mathtt{2}} = {\mathtt{1\,000}}$$

78 ÷ 2 = 39

Then you add the three zeros to 39 (the tens trick.) and you have the answer quickly and easily!

»You would need to know the angle incline of the slope

Not when the question asks merely how high the hill

All the car's KE is converted to gravitational potential energy

½mv² = mgh

∴ h = ½v² ÷ g

DONE

Thank you:) you rock!

a big tummyache!

Is this $${\frac{{\mathtt{8}}}{{\mathtt{2}}}}$$ or 8 ÷ 2?

No I didn't 

Did you downvote anon? Because anon is correct.

Oops correction 5

-1 I I thinks 

"2 minus negative 3" is 2 - (-3) and the double negatives cancel eachother out, making 2 + 3. Which equals 5, which is what anon said.

2-(-3)=5 is correct

So you have 17.5 cookies ---

If you end with only 1 cookie, the other children take 16.5 cookies.

If each of them took the same amount  16.5 ÷ 4  =  4.125 cookies   or:  4 1/8 cookies.

Use the site calculator to do the subtraction problem:

3154865 - 23233

#6 was a mistype: x - y = 4; 4x + y = 1 was what I meant.

As for #9, I mixed up the y-intercepts, so the correct answer is actually (-3, -3)

Right?

Btw, I like your new avatar, Geno.

To find the unit price, divide the cost by the number of units:  $32.45 ÷ 5  =       <--- your answer

I am very sorry Cue I am in the slow kindergarten class.  I don't know much yet.   

It is a good thing that I have big kids like you to help me.   :)))

6000 is correct

Geno is right, it helpes a lot 

That's a good calculator problem; fortunately this site has a good calculator --------

If you assume that the earth is approximately a sphere:

The formula for the surface area of a sphere is:  Area  =  4·π·r²

Find the radius of the earth by dividing its diameter by 2 and enter that value into the formula. 

6000 ( I think ) 

Compound interest formula:      A  = P(1 + r/n)^(n·t)

A = final amount             P = initial amount = 7650.00          r = rate (as a decimal) = 0.05 

         t = number of years = 9          n = number of time compounded per year = 4

--->   A  = 7650(1 + 0.05/4)^(4·9)

Enter that into the calulator to get the final amount.

5 dimes & 1 nickle

4 dimes & 3 nickles

11 nickles

3 dimes & 5 nickles

melody what grade are you in, you should know how much a dime is, a penny is, a nickel is, and a quarter is

I believe that you need to re-do #6 and #9.

For ease of typing, I will replace "f(x)" with "y":

To find the inverse of  y = 1/3x + 2:

There are two steps:

Step #1:  interchange x and y:                x  =  1/3y + 2

Step #2:  solve this equation for y:

               -- multiply each term by 3:     3x  =  y + 6

               -- subtract 6 from both sides:  3x - 6  =  y 

So the inverse of             f(x) = 1/3x + 2

is                      f-inverse(x)  = 3x - 6