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Kamila [148]
3 years ago
6

At 2:30 am the temperature in Joelle is 3 F. The temperature drops 3/4 of a degree in 30 min. What is the temperature on Joelle

at 3:00am?

Mathematics
2 answers:
Ghella [55]3 years ago
6 0
The answer is B. 2.25 degrees Fahrenheit because if you subtract 3/4 from 3, you shall get 2.25.
nasty-shy [4]3 years ago
5 0

Answer:  B. =2.25^{\circ}F


Step-by-step explanation:

Given: At 2:30 am the temperature in Joelle is 3 F.

The temperature drops 3/4 of a degree in 30 min.

3/4 of a degree= \frac{3}{4}\times1^{\circ}F=\frac{3}{4}=0.75^{\circ}F

Therefore, the temperature on Joelle after 30 min= 3^{\circ}F-\frac{3}{4}\ of\ 1^{\circ}F

=3^{\circ}F-0.75^{\circ}F

=2.25^{\circ}F

Thus, the temperature on Joelle at 3:00am==2.25^{\circ}F

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Step-by-step explanation:

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tia_tia [17]
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If cos x=8/17, and 270° &lt; x &lt; 360°<br> what is cos(2x)?
svp [43]

Answer:  \bold{-\dfrac{161}{289}}

<u>Step-by-step explanation:</u>

Given: cos x = \dfrac{8}{17}, x is in Quadrant 4

Use Pythagorean Theorem to find sin x:

8² + y² = 17²    

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Use the double angle formula to find cos (2x):

cos (2x) = cos^2 x - sin^2 x\\\\.\qquad=\bigg(\dfrac{8}{17}\bigg)^2-\bigg(-\dfrac{15}{17}\bigg)^2\\\\\\.\qquad=\dfrac{64}{289}-\dfrac{225}{289}\\\\\\.\qquad=-\dfrac{161}{289}

             

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Write a model for the statement V varies jointly as h and the fifth power of r. Group of answer choices LaTeX: V=khr^5 V = k h r
hjlf

Answer:

Option A)

V = khr^5

Step-by-step explanation:

We are given the following in the question:

V varies jointly as h and the fifth power of r.

V\propto h\\V\propto r^5

Combing the two equations, we get,

V\propto hr^5

Now, removing the sign of proportionality and adding the constant of proportionality, we get,

V = khr^5

where k is the constant of proportionality.

Thus, the correct answer is

Option A)

V = khr^5

7 0
3 years ago
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