George has a goal to make an average of 90% for the first grading period. there will be 10 grades averaged together to determine the grade for the grading period. so far, george has the grades shown. what score does george need to reach his goal?

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Hello, i need compare km^2 and km. what's difference in this?