495 – 2a5+ 4b + b
6x2 + 4(x2 - 1)
32y + 12y
8m + 14 – 12+ 4n

PLEASE HELP!!

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

What is the area of mnp? 40 m2 60 m2 68 m2 127.5 m2

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )