book Maths Puzzle Numerical Ability

what is 13+32+a,given a=7

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book Other Question

Suppose you are at a river resort and rent a motor boat for five hours starting at 7am. You are told the boat will travel 8 miles per hour upstream and 12 miles per hour returning. I was trying to find out the answer to this problem.

Find the slope, x and y intercepts of:

y=3/4x

my answer is this

m= 3/4

y= 0

x= -3/4

is this right