Xavier is thinking of a number. nine more than four times the number is the same as fifteen less than twice the number. what is xavier's number?

What is the missing step in this proof ?

Could somebody me with this radical simplification?

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?