Mrs. Bell graded 6 students' tests in 0.5 hours. At this rate, how long will it take for her to grade 30 students' papers? State your answer in hours and minutes

Which of the following is correct interpretation of the expression -4+13

Me with this one question, and i'll upvote the brainliest answer

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%)