Solve the equation using the quadratic formula x2 + 3x - 7 = 0

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?