On the last three physics exams a student scored 85, 87, and 88. What score must the student earn on the next exam to have an average of at least 90? The student must score at least %. (Simplify your answer. Type an integer or a decimal.)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
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Chapter1: Fundamental Concepts Of Algebra
Section1.1: Real Numbers
Problem 30E
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On the last three physics exams a student scored 85, 87, and 88. What score must the student earn on the next exam to have an average of at least 90?
%.
The student must score at least
(Simplify your answer. Type an integer or a decimal.)
Transcribed Image Text:On the last three physics exams a student scored 85, 87, and 88. What score must the student earn on the next exam to have an average of at least 90? %. The student must score at least (Simplify your answer. Type an integer or a decimal.)
Expert Solution
Step 1

Let student's score in last exam = x

x +  85 + 87 + 88 = 90 × 4

x + 260 = 360

x = 100

So

Student must score at least 100 marks or 100% .

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