Hello!
The formula for the area of a circle is:
A =
x r²
If x to the 12th power is divided by x to the 9th power:
Since they share same bases, and are being divided, it would be the same as x^{12 - 9), or x^{3}
Now, simply find the cube root of 125, which is 5.
Therefore, the number (x) must be equal to 5.
<em>Hope this helps! :)</em>
D.15 because 15 divided by 5 is 3 and 3+7 is equal to 10. Hope that helped
You solve the equation : t^2 - 9t - 90 = 0 ;
Δ = ( - 9 )^2 - 4 * 1 * ( - 90 ) = 81 + 360 = 441 ;
t1 = ( 9 +

) / 2 = 30 / 2 = 15 ;
t2 = ( 9 -

) / 2 = -12 / 2 = - 6 ;
The numbers are 15 and - 6 ;
Answer:

Step-by-step explanation:
Given
Let the number be x
So:

Required
Using trial and improvement, find x
This implies that we keep guessing the values of x until we get a value that match the equation.
Let

So, we have:


Take the square root of 625



Let

So, we have:


Take the square root of 729



At this point, we can conclude that x is approximately 729 because

So:
