Example of sets A, B, C, for A ∈ B, B ∈ C, but B should not contain A.

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤