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topjm [15]
3 years ago
6

You are buying gifts for 10 people. you decide to buy each person a CD or a DVD.

Mathematics
2 answers:
Anon25 [30]3 years ago
7 0
A CD Would Be The Most Reasonable Answer .

elena-s [515]3 years ago
3 0
BUY A CD..............
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A person 2 m tall casts a shadow 10 m long. At the same time, a building casts a shadow 80 m long. How tall is the building ?
Novosadov [1.4K]

Answer:

The building is 16 m tall.

Step-by-step explanation:

x/2 = 80/10

10x=160

10x/10 = 160/10

x=16

8 0
2 years ago
Read 2 more answers
Why could the mean of the data set below be misleading? 10 points! <3
MA_775_DIABLO [31]

the mean can be misleading, because there outlier (77), which is not close to the ages of the others, thereby changing the mean drastically.

hope this helps

8 0
3 years ago
Read 2 more answers
Which expression is equivalent to -9x-1 y-9 / -15x5 y-3
OverLord2011 [107]

Answer:

Step-by-step explanation:

4:22 4:12

5 0
3 years ago
ACT scores are normally distributed and from 2015 to 2017, the mean was 20.9 with a standard deviation of 5.6.
KatRina [158]

Answer:

You need a z-score of at least 1.09 to get accepted.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

\mu = 20.9, \sigma = 5.6

To get accepted into OSU, you need at least a 27. What is the z-score you need to get accepted?

We need to find Z when X = 27. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{27 - 20.9}{5.6}

Z = 1.09

You need a z-score of at least 1.09 to get accepted.

3 0
3 years ago
Abc daycare wants to build a fence to enclose a rectangular playground. the area of the playground is 910 square feet. the fence
Tatiana [17]
Given that <span>the area of the playground is 910 square feet, let the length of the playground be x, then the width of the playground is given by \frac{910}{x}

</span>Given that <span>the fence along three of the sides costs $5 per foot and </span>the fence along the fourth side, which will be made of brick, costs $15 per foot. <span>Let the side with the brick fence be the side which measures x feet.
</span>
Then the cost for fencing the entire playground is given by

C=5\left( \frac{910}{x} \right)+5x+5\left( \frac{910}{x} \right)+15x= \frac{9100}{x} +20x

For, minimum cost,

\frac{dC}{dx} =0 \\  \\ \Rightarrow- \frac{9100}{x^2} +20=0 \\  \\ \Rightarrow20x^2-9100=0 \\  \\ \Rightarrow x^2-455=0 \\  \\ \Rightarrow x=\pm\sqrt{455}

But x can't be negative.

Therefore, <span>the length of the brick fence that will minimize the cost of enclosing the playground is 21.33 feet.</span>
3 0
3 years ago
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