book Maths Puzzle Numerical Ability

The diameter of a round dinner plate is 10 inches. What is the area of the plate?
a- 314 square inches
b- 39.25 square inches
c- 78.5 square inches
d- 39.25 inches

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book Other Question

HELP!!! I have to write the logarithmic equation in exponential form. For example, the exponential form of "log5 25 = 2" is "52 = 25".

The 3 after log goes small...as if it was an exponent but to the bottom.

log3 27 = 3 7b-3=-2b+24

ive tried like everything! please help me!