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Romashka-Z-Leto [24]
2 years ago
14

I need help : D pleasee answer

Mathematics
2 answers:
Blizzard [7]2 years ago
4 0
There’s nothing showing up. I think you didn’t add a picture
natima [27]2 years ago
3 0

Answer:

The correct answer is the last one 80(5 + x)

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Y is inversely proportional to a^3
Ludmilka [50]

Answer:

y = 0.64/x^3

Step-by-step explanation:

If y is inversely proportional to a^3, we can write the equation:

y * a^3 = k

Using a = 2 and y = 10, we have:

10 * 2^3 = k

k = 80

If a is directly proportional to x, we can write the equation:

a = c * x

Using x = 4 and a = 20, we have:

20 = c * 4

c = 5

Now, using the value of a = 5*x in the equation y * a^3 = 80, we have:

y * (5x)^3 = 80

y * 125x3 = 80

y = 80/(125x3) = 0.64/x^3

6 0
2 years ago
The travel-to-work time for residents in Ventura County is unknown. Assume the population variance is 39. How large should a sam
katen-ka-za [31]

Answer:

A sample size of 128 is needed.

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{1-0.93}{2} = 0.035

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 1-0.035 = 0.965, so z = 1.81

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(square root of the variance) and n is the size of the sample.

How large should a sample be if the margin of error is 1 minute for a 93% confidence interval

We need a sample size of n, which is found when M = 1. We have that \sigma = \sqrt{39}. So

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

1 = 1.81*\frac{\sqrt{39}}{\sqrt{n}}

\sqrt{n} = 1.81\sqrt{39}

(\sqrt{n})^2 = (1.81\sqrt{39})^2

n = 127.8

Rounding up

A sample size of 128 is needed.

7 0
3 years ago
Which is bigger 4.953 or 4.951?
LekaFEV [45]
<span>4.953 is bigger compared to 4.951 because 3 is bigger than 1.

Hope this helps!</span>
6 0
3 years ago
Round 4,567 to the nearest thousand
Alisiya [41]

Answer:

5,000

Step-by-step explanation:

5-up round up 4-down round down

8 0
2 years ago
Read 2 more answers
In △EFG the measure of ∠G=90°, EF = 5.2 feet and FG = 1.6 feet. Find the measure of ∠F to the nearest degree.
tia_tia [17]

Answer:

72°

Step-by-step explanation:

cos x = 1.6/5.2 = 0.3077

x = cos`¹ 0.3077 = 72°

7 0
2 years ago
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