Distribute 2(x+10) please hurry

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?