book Maths Puzzle Numerical Ability

how do you multilpy the matrices

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At what points does the graph of f(x)=x^2+3x-18 intersect the x-axis? A troop of scouts hiked to the city at a rate of 2 mph. they rode back at a rate of 18 mph. If the round trip took 10 hours, how far is the city? What is the formula to solve this problem?