If the price of a purse went from $45 to $54, what was the percent of the change?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

You have 17 cats that live in houses on your street, 24 dogs, 3 fish, and 4 hamsters. what percent of animals on your block are dogs?

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?