822 hours. 10.25x822 is $8,425.50.
Y= -1/2x - 4
hope this helps! :)
The equation to find Amy's earning after tutoring for 15 hours is 300 dollars.
<h3>How to find an equation?</h3>
She earn 20 dollars for each hours she tutors.
E = earnings in dollars
H = hours of tutoring
The equation relating E and H are as follows:
E = 20H
Therefore, the equation to find Amy's earning after tutoring for 15 hours is as follows;
E = 20H
E = 20 × 15
E = 300 dollars
Therefore, Amy's tutoring for 15 hours is 300 dollars.
learn more on expression here: brainly.com/question/14492671
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Answer:
84
Step-by-step explanation:
The mean is calculated as
mean =
, then
= 21 ( multiply both sides by 4 )
sum = 84
Let the full marks = x
Then, it would be: x*40/100 = 60
x = 6000/40
x = 150
Full marks will be 150