The formula c=2pier relates the radius r of a circle to its circumference c. solve for the formula for r

Step-by-step explanation:

Im assuming you mean .

To solve for r means that you have to isolate it like c is currently. To do this you would have to divide by whatever it's multiplied by (in this case 2pi).

If you divide both the right and left sides by this you get

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!