5. Hypatia wants to use the elimination method to solve the system of equations below. She thinks that a variable will be eliminated if she multiplies the first equation by-1 and then adds the equations together.
Is she correct? Explain your reasoning.
x + 2y = 8
y+x=5

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Me asap on # : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?