Which ratio is equivalent to the unit rate 30 miles 1 gallon ? how was the unit rate transformed into the equivalent ratio?

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5