I need help for my test please!! The first qustions and second questions have the same questions!!

1.

The radius is 19

The diameter is given, so it is 38

The circumference is 119.38

2.

The radius is 21

The diameter is 42

The circumference is 131.95

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!

the answer is:

mean: 6

mad: 2.14