Help me to do this question plz plz plz
I will mark you as brainlist who has answered right ​

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

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%)