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D. 7/4

Step-by-step explanation:

A is on the 3/4 line

Since it it would be written as 1 3/4, it needs to be improper

3/4 + 4/4 = 7/4

7/4

Step-by-step explanation:

For the top part of the fraction, count as many lines until you get to A: 7

For the bottom part of the fraction, count how many lines between each two numbers: 4

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)