*50pts* timed test , will make brainliest simplify the following polynomial expression. (5x^4-9x^3+7x-1)+(-8x^4+4x^2-3x++5x -1)(2x-7)

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)

Identify the parent function that can be used to graph the function f(x)=3(x-9)2

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.