If the area of circular pond is 154 π square meter, find the radius of it's base

r= 12.4m (3 s.f.)

Step-by-step explanation:

Area of circle= πr², where r is the radius

154π= πr²

Divide both sides by π:

154= r²

r²= 154

Square root both sides:

r= 12.4m (3 s.f.)

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step-by-step explanation:

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!