John produced six times as many books as his brother. if their difference in production is 15, how many books did his brother produce

Apool measures 12.3 feet by 16.6 feet. if the longer wall of the pool has a diagonal of 17.8 feet, what is the volume of the pool? (round to nearest tenth)

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0