exam Maths Puzzle Numerical Ability

from my graph I am to predict the y value for an x value of -2. I am not sure what to do.

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exam Other Question

A car travels on the freeway at an average speed of 66 miles per hour. How many miles does it travel in 3 hours and 40 mintues? If f(x)=x squared+5, find f(a+h)-f(a)