book Maths Puzzle Numerical Ability

Solve (q+4)(3q-15)= 0

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book Other Question

Hmmmm, not sure how to draw the figure on the computer....

But having trouble getting the correct area and volume for figure in problem 14, Chapter 55 of Saxon Algebra 1. Mainl Hi could you please help me with this problem?
Use inverse matrix to Solve Linear System
3x + y= 5
5x +2y =9

Thank you so much for your time.