book Maths Puzzle Numerical Ability

i really need help on this problem i got stuck!
a=13, b=9 c?

please and thank you

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book Other Question

Passes through (8,3) is perpandicular to y=4x+11

a) y=-4x+35
b) y=4x-29
c) y=-1/4x+5
d) y=1/4x+1 Show a complete solution to each problem
Chrysler Sebring. After getting a 15% discount on the price of a new Chrysler Sebring convertible, Helen paid $27,000. What was the origin