Thirteen less than twice a number is fifteen. What is the equation? What is the number?

Which of the following represents the zeros of f(x) = 6x3 − 31x2 + 4x + 5? −5, one third , one half 5, − one third , one half 5, one third , − one half 5, one third , one half

Use set buikder notation to represent the following set: {, -2, -1, 0}

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.