9.931 times 10 to the 5th power. write in standard form

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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?

Atriangle has side lengths of x, x+11, and 3x+5. what is the perimeter?