exam Maths Puzzle Numerical Ability

how would this be solved :

1)Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8).

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exam Other Question

The weight of the truck is two times the weight of the car If f(x)=2x^2 -7x+3 find

Part A f(2)


Part B f(-3)

I have tried to solve this by plugging the 2 in for x and for part A came up with -3 and for part B came up with 42. am I doing this correctly