# MATH

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Erics 4 test grades are 85, 75, 97, 93 . What must she make on her 5th test to have an average of 87?

• MATH -

(85 + 75 + 97 + 93 + x)/5 = 87
350 + x = 435
x = 85

• MATH -

how did you get 435?

• MATH -

to get rid of the denominator ( 5 ), multiply both sides of the equation by 5/

so, 5 cancels out of the left side and
5 * 87 = 435 on the right side

• MATH -

Determine the values of x for which x-5/3x+6 is undefined

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