What is happening to the graph when the x-values are between 4 and 8

17 in long 1.3 ft wide and 8in high what is the volume

Find the domain and range of the following function f(x) = 51x - 21+ 4

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%)