John has grades of 82 and 98 on his first two history tests. What must he score on his third test so that his average is at least 88?

John's average on all three tests, assuming a score of S on the third test, would be

(82 + 98 + S)/3

He wants the average to be at least 88, so solve the inequality:

(82 + 98 + S)/3 ≥ 88

82 + 98 + S ≥ 264

180 + S ≥ 264

S ≥ 84

So John needs to obtain a grade of at least 84 on the third test to get the average he wants.

1760 kilometers

step-by-step explanation:

multiply the amount of time the plane took to travel by it's speed