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EastWind
8 days ago
14

Mariah has a spinner that has 10 equal sections, each containing a different number from 1 to 10. Mariah determines about how ma

ny times the spinner will land on a number that is greater than 7 in 250 spins, and her work is shown below.
P (number greater than 7) = StartFraction Number greater than 7 over Total number of sections EndFraction times number of spins = StartFraction 4 over 10 EndFraction (250) = 100.

What mistake did Mariah make, if any?
Mathematics
2 answers:
PIT_PIT [12.4K]8 days ago
8 0
She mistakenly included a 4 instead of a 3. There are only three numbers exceeding 7, which are 8, 9, and 10. Mariah likely included 7 in her count, which resulted in her calculation being off.
PIT_PIT [12.4K]8 days ago
3 0
Mariah opted for 4 instead of the correct count of 3. I struggled with a test question containing this scenario.
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To achieve a positive profit p(x)>0, we start with:
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Next, we solve for x:
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The parameters are:
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We will apply the quadratic formula:
x_{1} = \frac{-b+ \sqrt{ b^{2}-4ac } }{2a} \\ \\ x_{2} = \frac{-b- \sqrt{ b^{2}-4ac } }{2a} \\ \\ x_{1} = \frac{-7+ \sqrt{ 49-24 } }{-4} = \frac{-7+5 }{-4} = \frac{-2 }{-4} = \frac{1}{2} \\ \\ x_{2} = \frac{-7- \sqrt{ 49-24 } }{-4} = \frac{-7-5 }{-4} = \frac{-12 }{-4} = 3

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1 month ago
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According to the U.S. Census Bureau (2016), a substantial pay gap still exists. The average American man, with an advanced colle
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Answer:

The earnings gap, over a career spanning 30 years, between men and women totals $1,200,150

Step-by-step explanation:

Calculated annually.

The typical male earns $90,761 each year.

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Therefore, the annual difference is:

90,761 - 50,756 = 40,005

Across 30 years:

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2 months ago
What is the factored form of a2 – 121?
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Response:

The factored expression a^2-121 is (a+11)(a-11).

Detailed explanation:

Provided: a^2-121

Our goal is to express the given equation in a factored form.

Factoring pertains to rewriting an expression so that the product of its factors yields the original expression

Let’s consider the expression a^2-121.

We recognize the algebraic identity x^2-y^2=(x+y)(x-y)

Thus, we have a^2-121=a^2-(11)^2.

Matching with the above identity, we assign x= a, and b = 11, leading to

a^2-(11)^2=(a+11)(a-11).

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