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UkoKoshka [18]
3 years ago
7

Solve. If there are X teams in a sports league and all the teams play each other twice, a total of N(x) gamers are played, where

N(x)=x^2-x. A soccer league has 10 teams, each of which plays the others twice. If the league pays $46 per game for the field and officials, how much will it cost to play the entire schedule?
Mathematics
2 answers:
s2008m [1.1K]3 years ago
6 0

Answer:

\$4140

Step-by-step explanation:

According to the problem, <em>x </em>refers to teams, and N(x)=x^{2}-x represents numbers of games played.

So, if there are 10 teams, we just have to replace this value for the <em>x</em> and calculate the number of games. Once we have it, we multiply all games by $46, which is the cost per game.

N(x)=x^{2} -x\\N(10)=(10)^{2}-10=100-10=90

This means that in the entire schedule there are 90 games. If each one costs $46, the whole schedule will cost:

90(\$46)=\$4140

WINSTONCH [101]3 years ago
4 0

number of games is 90, so cost is

<span>90×46=4140</span>

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The horizontal distance of E is 9 units to the east of point F. Determine the coordinates of F if the coordinates of E are (3,8)
Vsevolod [243]

Answer:

(-6,8)

Step-by-step explanation:

By reading the question you can determine that point E is to the east, or the right, of point F by 9 units. This ultimately means you must subtract 9 units on the horizontal (x-axis) in order to get to point F.

6 0
3 years ago
The graph of a quadratic function has a vertex located at (7,-3) and passes through points (5,5) and (9,5). Which equation best
Serga [27]

Answer:

B) f(x)=2(x-7)^2-3.

Step-by-step explanation:

The vertex form of the equation is given by f(x)=a(x-h)^2+k.

We plug in the vertex to obtain:

f(x)=a(x-7)^2-3.

Since the graph passes through (5,5) and (9,5), they must satisfy its equation.

5=a(9-7)^2-3.

5+3=4a.

8=4a

Divide both sides by 4.

a=2

Therefore the equation is:

f(x)=2(x-7)^2-3.

4 0
3 years ago
Are 4/16 and 0.25/2 equivalent numbers? If so, explain how they are.
Aleksandr-060686 [28]
Two fractions are equivalent if the product of the numerator of the first and the denominator of the second is equal to the product of the numerator of the second and the denominator of the first.
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3 0
3 years ago
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 335335 babies were​ born
strojnjashka [21]

Answer:

The 99​% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

Step-by-step explanation:

Confidence Interval for the proportion:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

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

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 335, \pi = \frac{268}{335} = 0.8

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.7437

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.8563

For the percentage:

Multiplying the proportions by 100.

The 99​% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

7 0
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kati45 [8]
(f+g)(3) = f(3) + g(3) = 6(3) + 3 + 3 -7 = 18 +6 -7 = 17.

Answer: 17
8 0
3 years ago
Read 2 more answers
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