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lesya [120]
3 years ago
11

(SOMEONE HELP ME PLEASE, AND NO LINKS)

Mathematics
1 answer:
Kazeer [188]3 years ago
7 0

Answer:

7 I think

Hope's ti helps

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ABC Game store sells new games, n, for $19 and used games, u, for $9. The store earned $7500 in revenue last month. The store so
Step2247 [10]

Answer:

19n+9u=7500 and 4u-n

Step-by-step explanation:

7 0
2 years ago
Using the graph f(x)=x^2 as a guide, describe the transformations, and then graph each function.
Margarita [4]
Down refers to the movement along the y axis and left and right refer to movement along the x axis. 20. down 2, no y movement  21. 5 to the left, no y movement  22. to the right 1, no y movement  23. 4 to the left, down 3  24. to the left 2 and up 2  25. 4 to the right and down 9  26. opens up a bit wider, no x or y movement (picture it opening like a flower blooming) 27. opens downward and is very very close to the y axis  28. opened up SUPER wide, like a large shallow bowl.
6 0
3 years ago
The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular st
Ipatiy [6.2K]

Answer:

We need a sample size of at least 101

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.99}{2} = 0.005

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.005 = 0.995, so z = 2.575

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

What sample size is needed to estimate the true average speed to within 2 mph at 99% confidence?

We need a sample of at least n.

n is found when M = 2. So

M = z*\frac{\sigma}{\sqrt{n}}

2 = 2.575*\frac{7.8}{\sqrt{n}}

2\sqrt{n} = 2.575*7.8

\sqrt{n} = \frac{2.575*7.8}{2}

(\sqrt{n})^{2} = (\frac{2.575*7.8}{2})^{2}

n = 100.85

Rounding up

We need a sample size of at least 101

8 0
3 years ago
Read 2 more answers
Which is a tangent of circle P?pls helpt ASAP!!!!
oee [108]
<h3>Answer: Choice C)  line n</h3>

Explanation:

Tangent lines touch the circle at exactly one point.

7 0
2 years ago
Suppose the linear regression line y = 4.009x - 77.531 predicts a pizza
fredd [130]

Answer:

Option C, 1225

Step-by-step explanation:

y=4.009x-77.531

selling 325 pizzas, so x=325, now putting the value of x in the equation,

y=4.009×325-77.531

or, y=1225.394

y = 1225.394, which is the profit, if we approximate it to the nearest value, it's $1225

7 0
3 years ago
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