Ryan bought a pack of gum for $0.89, a soda for $1.39, and a donut for $0.75 from the convenience store. how much was his total?

a : $3.03
b : $2.03
c : $2.83
d : $1.83

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Write an algebraic expression for the word expression the quotient of c and 8

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=