What is the domain of f(x) = 5x – 7? {x | x > –7}
{x | x < –7}
{x | x > 0}
{x | x is a real number}

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Identify the number 127 as a rational or irrational. explain

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)