4. Part A How many solutions does the equation 3x + 6 = 9(x + 4) have? What are the solutions? Show or explain your work.

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%)