Need someone’s help ASAP

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

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%)

Write an inequality for this sentence the quotient of a number and -5 increased by 4 is at most 8