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emmasim [6.3K]
4 years ago
7

R/5=9/21 solve for r

Mathematics
1 answer:
Hunter-Best [27]4 years ago
4 0
R is r right?

at least for me.

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Find the value of tan(30).
WINSTONCH [101]

Answer:

(sqrt3)/3

Step-by-step explanation:

7 0
3 years ago
If f varies jointly as q^2 and h and f=-81 when q=3 and h=3 find f when q =4 and h=3
Aneli [31]

Answer:

F=48

Step-by-step explanation:

see the explanation and workings in the picture above.

5 0
4 years ago
How is "y more than 4 is -36" written and what is the answer ​
Crazy boy [7]

Answer:

y+4=-36 and the answer is y=-40

Step-by-step explanation:

So the word is means equals, meaning we can change it to say

"y more than 4 = -36

and more than means addition so we can put a plus sign there and we get

y+4=-36

then to solve this equation we need to get y by itself on one side and to do that we can move the 4 to the other side by subtracting it on both sides to cancel out the addition and we get y=-40

I hope this helps and please don't hesitate to ask if there is anything still unclear!

8 0
3 years ago
The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If 64 women are
shtirl [24]

Answer:

0.3569 is the probability that they have a mean pregnancy between 266 days and 268 days.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ =  268 days

Standard Deviation, σ =  15 days

We are given that the distribution of lengths of pregnancies is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

Standard error due to sampling =

\displaystyle\frac{\sigma}{\sqrt{n}} = \frac{15}{\sqrt{64}} = \frac{15}{8}

P(pregnancy between 266 days and 268 days)

P(266 \leq x \leq 268) = P(\displaystyle\frac{266 - 268}{\frac{15}{8}} \leq z \leq \displaystyle\frac{268-268}{\frac{15}{8}}) = P(-1.0667 \leq z \leq 0)\\\\= P(z \leq 0) - P(z < -1.067)\\= 0.5000 - 0.1431 = 0.3569 = 35.69\%

P(266 \leq x \leq 268) = 35.69\%

6 0
3 years ago
A 6 inch perosnal pizza has 570 calories with 240 o fthe from fat. a 16 inch pizza is cut into 8 slices. Estimate the number of
Diano4ka-milaya [45]

Answer:  

The number of calories is going to be pretty close to proportional to the area of the pizza.  Figure out the area of a 6-ince pizza, and then figure out the area of a 14-inch pizza.  Then you're going to get a proportion:

 

(Area of 14 inch pizza) is to (Area of 6 inch pizza) as (Number of calories in 14 inch pizza) is to (Number of calories in 6 inch pizza.

 

You know the areas of both sizes and the number of calories in the 6 inch pizza, so you should be able to find the number of calories in the 14 inch pizza.

 

Then divide by 8 to get the number of calories in each slice.        

 

8 0
3 years ago
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