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vladimir2022 [97]
3 years ago
9

In 2002, the temperature on the first day of summer was 79°F. This is 4°F less than it was on the first day of summer the previo

us year. What was the temperature on the first day of summer in 2001?
A. In 2001, the temperature was 75°F.
B. In 2001, the temperature was 93°F.
C. In 2001, the temperature was 83°F.
D. In 2001, the temperature was 82°F.
Mathematics
1 answer:
kap26 [50]3 years ago
5 0

Answer:

  C. In 2001, the temperature was 83°F.

Step-by-step explanation:

  79 is 4 less than 83.

The temperature in 2001 was 83 °F.

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Suppose that the mean time that visitors stay at a museum is 94.2 minutes with a standard deviation of 15.5 minutes. The standar
Maurinko [17]

Answer:

94.2 -0.994*3.1 = 91.1186

94.2 +0.994*3.1 = 97.2814

And the 68% confidence interval is given by (91.1186, 97.2814)

Step-by-step explanation:

For this case we know that mean time that visitors stay at a museum is given by:

\bar X = 94.2

The standard deviation is given by:

s= 15.5

And the standard error is given by:

SE = \frac{s}{\sqrt{n}} =3.1

And we want to interval captures 68% of the means for random samples of 25 scores and for this case the critical value can be founded like this using the normal standard distribution or excel:

z_{\alpha/2}= \pm 0.994

We can find the interval like this:

\bar X \pm ME

And replacing we got:

94.2 -0.994*3.1 = 91.1186

94.2 +0.994*3.1 = 97.2814

And the 68% confidence interval is given by (91.1186, 97.2814)

7 0
3 years ago
Need help asap......
Korvikt [17]

Answer:

32

Step-by-step explanation:

(2x+20)+3x=180\\5x+20=180\\5x=180-20=160\\x=160/5=32

6 0
2 years ago
Explain why the numerical expression 4 less than 20 is written as 20-4 and not 4-20
Phantasy [73]
When converting English phrases into mathematical expressions/equations, we do things from left to right. That is why it's 4 - 20 instead of 20 - 4.

This rule is applied to division as well.
8 0
3 years ago
Which expression is represented by the model?<br> x-3<br> x+3<br> -X-3<br> -X+3
Crazy boy [7]
-x +3 i think , i hope that helps
5 0
3 years ago
Read 2 more answers
Anyone please help me? tysm!
Oksana_A [137]

Answer:

6 ft

Step-by-step explanation:

The surface area of a cube is given by

SA = 6s^2

216 = 6s^2

Divide each side by 6

216/6 = 6s^2/6

36 = s^2

Take the square root of each side

sqrt(36) = sqrt(s^2)

6 =s

Each side is 6ft

7 0
3 years ago
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