Andrew and Alex share their sandwiches so that for every 1 sandwich for Andrew, Alex get 2. There is a total of 9 sandwiches. How many sandwiches does Andrew get?

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

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)

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.