Simplify the operation f(x)+g(x) , such that: f(x) = 3.r? + 9x - 21 g(x) = 4x4 – 2x² + 4x – 40​

1. a right triangle is graphed on a coordinate plane. find the length of the hypotenuse. round your answer to the nearest tenth. 2. use the angle relationship in the figure below to solve for the value of x. assume that lines a and b are parallel and line c is a transversal.

Each of the four sides of a swimming pool measures 9 meters. the pool is 5 meters deep. how much water will be needed to fill it completely? a. 45 cubic meters b. 81 cubic meters c. 225 cubic meters d. 405 cubic meters reset next

Anyone know? is appreciated! will mark brainliest if correct!