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Which expression is equivalent to 2(a+3) when a = 3?

2(3)

5(3)

2(3)+ 3

2(3)+6

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

Asap easy 6th grade 30 pts describe how to rewrite a power with a positive exponent so that the exponent is in the denominator.