4. two more than a certain number is 15 less
than twice the number.

17

Step-by-step explanation: Call the certain number x. Two more than x is x+2. 15 less than twice the number is 2x-15.

Setting them equal, x+2=2x-15 and solving gives x=17

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step-by-step explanation:

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: