Add. Be sure to simplify and have your answer in CORRECT scientific notation. (1.63 x 10 7 ) + (2.4 x 10 7 )

Solve the system of equations. y= 2x y= x^2 - 15

What is the solution of the systems of equations? y=2/3x+3 x=-2

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?