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Mrac
10 days ago
15

A calculator was purchased for $29. The wholesale cost was $20. What was the percent markup?

Mathematics
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The equation x2 – 1x – 90 = 0 has solutions {a, b}. What is a + b
PIT_PIT [12445]
X^2 - x - 90 =0
This quadratic equation is in the standard format ax^2+ bx + c
The total of the solutions can be found using -b/a (where a and b are the coefficients from the original equation, not the solutions)
The resulting answer is 1/1 = 1
8 0
1 month ago
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Of 50 people, 38 have brown hair, 29 have brown eyes, and 23 have both brown hair and brown eyes. how many have neither brown ha
babunello [11817]
Is the process like this: 38+29=67, then 67-23=44
50-44=6
thus possibly A?
8 0
1 month ago
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The spending limit on John’s credit card is given by the function f(x)=15,000+1.5x , where x is his monthly income. f^-1x . The
zzz [12365]
1. "The limit on John's credit card is defined by the function f(x)=15,000+1.5x," indicating that if John's monthly income is $5,000, he can spend a maximum of f(5,000)=15,000+1.5*5,000=15,000+ 7,500=22,500 (dollars). As another example, if John's monthly income is $8,000, then he can spend up to f(8,000)=15,000+1.5*8,000=15,000+ 12,000=27,000 (dollars). 2. If we consider the maximum amount John can spend as y, it can be represented as y=15,000+1.5x. To express x, the monthly income, in terms of y, we rearrange this equation: y=15,000+1.5x results in 1.5x = y-15,000. Therefore, in functional notation, x is a function, referred to as g, based upon y, the maximum sum. Generally, we denote the variable of a function by x, so we redefine g as: This tells us that if the maximum amount that John can spend is $50,000, then his monthly income would be $23,333. 3. If John's limit is $60,000, his monthly income equals $30,000. Note: g is deemed as the inverse function of f because it reverses the actions of f.
6 0
2 months ago
A 95% confidence interval for the population proportion of professional tennis players who earn more than 2 million dollars a ye
Svet_ta [12734]

Response:

e. 545

Detailed explanation:

In a survey sample containing n individuals, with a success probability of \pi, and a confidence level of 1-\alpha, the ensuing confidence interval for proportions is established.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

Wherein

z denotes the z-score corresponding to a probability value of 1 - \frac{\alpha}{2}.

For this scenario, we find:

The estimate averages the two bounds. Thus \pi = \frac{0.82+0.88}{2} = 0.85

95% confidence level

Consequently, z represents the z value corresponding to the p-value of 1 - \frac{0.05}{2} = 0.975, hence Z = 1.96.

The lower boundary of this interval is:

L = \pi - z\sqrt{\frac{\pi(1-\pi)}{n}}

In this query, L = 0.82. Therefore

0.82 = 0.85 - 1.96\sqrt{\frac{0.85*0.15}{n}}

1.96\sqrt{\frac{0.85*0.15}{n}} = 0.03

0.03\sqrt{n} = 1.96\sqrt{0.85*0.15}

\sqrt{n} = \frac{1.96\sqrt{0.85*0.15}}{0.03}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.85*0.15}}{0.03})^{2}

n = 544.23

Thus, the accurate response is:

e. 545

4 0
1 month ago
Mr.Rowley has 16 homework papers and 14 exit tickets to return. Ms. Rivera has 64 homework papers and 60 exit tickets to return.
Svet_ta [12734]
Mr. Rowley
16:14

Ms. Rivera
64:60

Upon simplifying 64:60, it becomes 16:15.
64/4 = 16
60/4 = 15

They are not equivalent since Ms. Rivera holds 1 more exit ticket than Mr. Rowley.
8 0
1 month ago
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