Which function has a domain and range that includes all real values?

Interest begins accruing the date of the transaction except for auto loans mortgages credit card cash advances credit card purchases

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%)

Can someone show me step by step how to do this?