Evaluate the expression when =a−3 and =b4 . 4 b - a

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?

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2