Problema Solution
on the last three physics exam a student scored 89,86.87. what scar must the student earn on the next exam to have an average of at least 90?
Answer provided by our tutors
let 'x' represent the score on the next exam, x>0
(89 + 86 + 87 + x)/4 >= 90
by solving we find:
x >= 98
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the student must earn at least 98 on the next exam.