Answer:
40%
Step-by-step explanation:
32/80=.4
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➷ The formula for surface area of a cylinder is:

The radius is half the diameter
radius = 8/2 = 4
Substitute the values in:

Solve it:
surface area = 
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Answer:b
Step-by-step explanation:
Given
Hilda draws a card from a deck of cards and it is seven.
It is certain that card is 7 so there a 4 cards which can be 7
i.e. 7 of hearts,7 of spades,7 of club,7 of diamond
So probability that it is the 7 of spades is