Which of the following equations demonstrate that the set of polynomials is not closed under the certain operations?
a. addition: (x^2+x)+(x+1)=x^2+2x+1
b. division: (x^2-5x+3)/(x-2)=x-3+-3/x-2
c. multiplication: (x^2-5x+3)(x-5)=x^3-10x^2+28x-15
d. subtraction: (3x^4+x^3) - (-2x^4+x^3)=5x^4

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

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