常州球刀:easy math question 3

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The Morrisons fence 3 sides of their yard. The back is 14 m and the sides are each 8.75m. The fence posts are 1.75m apart.

a.) What is the length of the fence?

b.) How many fence posts are used?

c.) Fence posts cost $13.99 each, and fencing is $ 4.75/m. Find the total cost of the fence.

d.) What assumptions have you made about how the fence is built?

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a) length of the fence=back+side+side
=14+8.75+8.75
=31.5m
b) one post is need at the end of one side, one is need at the left corner, one is need at the right corner, one is need at the end of the other side, so there are 4 fence posts are needed.
c) total cost=4*$13.99+3*$4.75
=$238.09

C