On Sunday, I bought three dresses for $900. I gave one of thein to my
friend and she paid me 35% of the total cost of all the dresses. How much
did my friend give me?

Three dresses for $900. This means each dress costs $300. You gave your friend one of the dresses. She paid 35% of the total cost for all three dresses.

Let P = the amount of money you received from your friend.

P = 900 x 0.35

P = $315

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.