Find the unit rate if 12 tablet cost $1,440

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

Which of the following points is a solution to the system of equations shown? y - x = -1 x + y = -5