Last year mr. peterson was able to plant 4 rows of carrots with 13 plants in each row. this year he plants to plant twice as many rows with twice as many carrot plants in each. how many care of plants what he planned this year

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%)