exam Maths Puzzle Numerical Ability

Graph a line that passes through (4, -2) and is perpendicular to a line whose slope is -3.

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Hello I need your help....I have to multiply this equation...Can you help me?

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Number 20

6x^2(-9x^3) Two cars travel in opposite directions from the same point. The rate of one car is 10mph less than the rate of the other car. After 8 hours, the cars are 560 miles apart. Find the rate of each car.