Prove for any value of y the value of expression y^4 - (y^2-9) (y^2+9) is divisible by 9.

What does it mean when 2 magnets repel each other?

Show (by giving a step-by-step algebraic derivation from the LHS to the RHS) that if 〈?,∗〉 is a binary algebraic structure where ∗ is commutative, then for all a, b, c ϵ S a * (b*c) = (c*b) * a

Which is a simplified form of the expression - 6a + 2 (2a + 2) ? A. - 2a + 4 B. - 2a - 4 C. 2a + 4 D. 2a - 4

Naomi read nine pages and 27 minutes 12 pages and 36 minutes 15 pages in 45 minutes and 50 pages in one 15 minutes is it pop proportional

What is the solution to the following system of equations? {y-2y=4 {y=5x+1

A dog weighs 2 pounds more than a cat. 3 cats and 4 dogs together weigh 43 pounds. How much does a dog weigh? How much does a cat weigh?

Is y equals x to the third power + x equals - 3 then what does y equal

What is f and x in f (x) = 7

18 * 5 * 10 * 9 * 7

Home Depot wants to buy a new line of fertilizers. Manufacturer A offers a 21/13 chain discount. Manufacturer B offers a 26/8 chain discount. Both manufacturers have the same list price. What manufacturer should Home Depot buy from, show why?