Select the proper placement for parentheses to speed up the addition for the expression 4 + 6 + 5 a. 4 + (6 + 5) b. (5 + 4) + 6 c. (4 + 6) + 5 d. (5 + 6) + 4

I’m stuck on this i don’t understand.

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project