book Maths Puzzle Numerical Ability

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

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I am trying to help my daughter with Alg 1 homework - is the correct answer -11?
2x - 7 = 3x =4 If anglesA,B, and C are the sides of a triangle such that sin(A+B)=1/cos(C) and cos(A+B)=cos(C), then show that the triangle is a right triangle