Plz show me step by step how to solve these equations asap. tysm!

13. x^6-64x^4+x^2-7x-51; x=8

14. -x^3+3x^2+5x+1; x=-12

15. 2x^3+4x^2+6x+7; x=1/2

(btw, 13, 14, and 15 are not a part of the equation)

Find the solution of system of equation y= x-4 y=4x+2

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

Write the contrapositive of the conditional statement. determine whether the contrapositive is true or false. if it is false, find a counterexample. a converse statement is formed by exchanging the hypothesis and conclusion of the conditional. a) a non-converse statement is not formed by exchanging the hypothesis and conclusion of the conditional. true b) a statement not formed by exchanging the hypothesis and conclusion of the conditional is a converse statement. false; an inverse statement is not formed by exchanging the hypothesis and conclusion of the conditional. c) a non-converse statement is formed by exchanging the hypothesis and conclusion of the conditional. false; an inverse statement is formed by negating both the hypothesis and conclusion of the conditional. d) a statement not formed by exchanging the hypothesis and conclusion of the conditional is not a converse statement. true