-1/4 x + 10=7 show work

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Anumber cube is rolled two times in a row. find the probability it will land on 2 on the first roll and a number greater then 4 on the second roll

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm