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Tcecarenko [31]
2 years ago
13

Harry took total of 27 quizzes over the course of 3 weeks

Mathematics
2 answers:
Mandarinka [93]2 years ago
7 0

Answer:

Jesus Harry thats a lot of quizzes

Step-by-step explanation:

but each week he took 9 quizes if thats the question

nikitadnepr [17]2 years ago
3 0

Answer:

9 quizzes a week

Step-by-step explanation:

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X = -2y + 300 3y = 800 - 4x
devlian [24]

Answer:

<h2>x = 140, y = 80</h2>

Step-by-step explanation:

\left\{\begin{array}{ccc}x=-2y+300&(1)\\3y=800-4x&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\\\3y=800-4(-2y+300)\qquad\text{use the distributive property:}\ a(b+c)=ab+ac\\\\3y=800+(-4)(-2y)+(-4)(300)\\\\3y=800+8y-1200\\\\3y=8y-400\qquad\text{subtract}\ 8y\ \text{from both sides}\\\\-5y=-400\qquad\text{divide both sides by (-5)}\\\\y=80\\\\\text{Put it to (1):}\\\\x=-2(80)+300\\\\x=-160+300\\\\x=140

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