What is the expression in factored form . 9x^2 -4 show detailed work so i can understand how to do this on my own later.

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

The measures of the angles in △abc are given by the expressions in the table. angle measure angle a 65° angle b (3x−10)° angle c (2x)∘ find the value of x. then find the m∠b and m∠c.