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99
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avatar+1112 

Heather made an 82% on her first test. What must she get on her next test to have an average of at least 90%? (assume 100 points per test). (This also has to be done algebraically).

 Feb 19, 2019
 #1
avatar+18492 
+1

There are two scores to average to 90 %

 

(82 + x )/2 = 90

82+x = 180

x = 98             She has to make at least 98 %  on the second test.

 

 

(red  edited)

 Feb 19, 2019
edited by ElectricPavlov  Feb 19, 2019
 #2
avatar+101871 
+2

82 + x

_____    ≥     90             multiply both sides by 2

    2

 

82 + x  ≥  180            subtract 82 from both sides

 

x ≥ 98

 

She must make at least a "98"

 

cool cool cool        

 Feb 19, 2019

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