(BRAINLIEST) + 30 POINTS! (Algebra 2, Polynomial Identities) (x + y) (x^2 + 2xy + y^2)

Please,
-Label and display your new polynomial identity
-Prove that it is true through an algebraic proof, identifying each step
-Demonstrate that your polynomial identity works on numerical relationships

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

If you answer 2+2 you will get over 80 points