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iren [92.7K]
2 years ago
13

On a science test, students earn 5 points for each correct answer and lose 2 points for each incorrect answer. If there are 56 q

uestions on the test, a student’s score is shown by the expression 5(56−w)−2w, where w represents the number of wrong answers. Pete says that the expression 7(40−w) could also be used. Is Pete correct? Why or why not? Show your work.
Mathematics
1 answer:
riadik2000 [5.3K]2 years ago
6 0

Answer:

He is wrong

Step-by-step explanation:

t r u s t

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sp2606 [1]

Answer:

Max = 15

Step-by-step explanation:

Given

s(y) = -2y^2 + 60y + 10

Required

Determine number of items that gives maximum earnings;

The general form of a quadratic equation is:

s(y) = ay^2 + by + c

And the maximum is calculated as:

Max = \frac{-b}{2a} If a<0

Comparing s(y) = ay^2 + by + c to s(y) = -2y^2 + 60y + 10

We have that:

a = -2     b = 60   c = 10

Substitute these values to

Max = \frac{-b}{2a}

Max = \frac{-60}{2 * -2}

Max = \frac{-60}{-4}

Max = 15

<em>The number of item that maximizes the function is when y = 15</em>

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3 years ago
7r+4r+10s what is the answer
Sophie [7]

Answer:

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Step-by-step explanation:

8 0
3 years ago
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katovenus [111]

Answer:

spin it 35 times

Step-by-step explanation:

there are 3 multiples of 4 under 15 (4,8,12) so the chances of a 4 will be 3/15 or 1/5 to find the chances of 7 times just multiply by 7 so the finale answer is 1/35

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How do I graph the following set {x is an even number, -1≤x&lt;12}
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Step-by-step explanation:

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Step-by-step explanation: English pls?

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