Which phrase could the expression x-4 represent? a number less than 4
the difference of a number and 4
the sum of a number and 4
four less a number

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)

Which expression is rational? 6. , square root two, square root 14, square root 49

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g