What is the answer for b, and why?
1 answer:
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Answer:
93
Step-by-step explanation:
The average is calculated as
average =
On 3 quizzes
= 73 ( multiply both sides by 3 )
sum = 219
On 4 quizzes, letting x be the score on fourth test
= 78 ( multiply both sides by 4 )
sum + x = 312 , that is
219 + x = 312 ( subtract 219 from both sides )
x = 93
She must score 93 on the next quiz
Answer:
Step-by-step explanation:
So we have the equation:
First, multiply both sides by 3. This cancels out the denominator:
The left side cancels. Multiply the right:
Add 2 to both sides. The 2s on the left cancel:
Divide both sides by -2. The -2 on the left cancel.
Therefore, the answer is 11.