What’s the distance between -1/2 and 5/4 ?

In which form is the following function written? y = - 2(x – 3)(x + 5)

The anwser cause i do not understand just plez

The triangle shown has a hypotenuse with a length of 13 feet. the measure of angle a is 20 degrees. and the measure of angle b is 70 degrees. which of the following is closest to the length, in feet, of line segment ac? no need to use a calculator to find the trig numbers. each function is listed below. 4.4 5 12.2 35.7