The rails of a metro must pass through a cylindrical tunnel 6 m in diameter. How wide must the track platform be if the maximum height in the center of the rails is to be 4.5 m? Express your answer to the nearest tenth of a meter.

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]