tax gets added to the price of the camera
so the equation is:
x + 0.07x = 45; x = $42.06
3/4 *x-4
3/4 x 3/4 x 3/4 x 3/4
3 13/81
35 is your answer (I did it on a triangle calculator)
Given problem;
A = 4 π R²
To solve for R, we have to make it the subject of the expression.
Since
A = 4 π R² , follow these steps to find R;
Multiply both sides by
A x
=
x 4 π R²
= R²
Then find the square root of both sides
√R² =
R = 
The solution is 