book Maths Puzzle Numerical Ability

I am trying to help my daughter with Alg 1 homework - is the correct answer -11?
2x - 7 = 3x =4

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jumping rope can burn 600 calories per hour; write and solve an inequality to find the number of hours of jumping rope that it would take for you to burn at least 450 calories. I need help with this problem. "The distance "d", in meters, that an object falls after "t" seconds is given by the formula d = 4.9t(squared). Graoh this equation for 0 < t < 6, wh