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define a variable, write an inequality, and solve ; Ray had scores of 75, 82, 94, and 77 on his first four science test. what must he score on the next test to have an average of at least 85?



Answer :

[tex] \frac{x+75+82+94+77}{5} = 85[/tex]

[tex] \frac{x+328}{5}=85 [/tex]

x + 328 = 5(85)

x + 328 = 425

x = 425 - 328

x = 97

He must score 97 on the next test to have an average of at least 85

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