47/8 + (-6 1/4) how do i find common denominators?

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2