72^2−2(11/8−3/8). HELP PLS

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

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%)

Alex's monthly take home pay is $2,500. what is the maximum bad debt payment he can maintain without being in credit overload?