If david must score 90 percent on his test in order to a if he scored a 89,90,98,86 what is the score on his fifth test

David's score on his fifth test would be an 87. If you add up all the scores from his first to his fourth test, it would 363. However, since there are five tests, in order to get a 90 percent, the sum of all five test scores would be 450. 450 - 363 = 87.

The answers are 20,30,80,180,960,890,1230,4560. on the first row