What is the formula for finding the rate in Simple Interest?

A = P(1 + rt)

Step-by-step explanation:

P is the Principal amount of money to be invested at an Interest Rate R% per period for t Number of Time Periods.

100I/PT

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256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

2nd one in the first row is correct