onateandrea06 onateandrea06

06-10-2017
Mathematics

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Ted needs an average of at least 70 on his three history tests. He has already scored 85 and 60 on two tests. What is the minimum grad ted needs on his third test? Write and solve an inequality.

Respuesta :

06-10-2017

(x+y+z)/3≥70
x=85
y=60
(85+60+z)/3≥70
(145+z)≥70*3
(145+z)≥210
z≥210-145
z≥65

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