Can somebody solve this

Wait are these right?! PLS

Korolek [52]

Answer:

yes they are good job

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

A swimming pool can be filled in 15 hours if water enters through a pipe alone, or in 23 hours if water enters through a hose a

kykrilka [37]

Answer:

9.08 hours

Step-by-step explanation:

in order to fill 1 pool

fill rate by pipe = 1 pool / 15 hours = 1/15 pool per hour

fill rate by hose = 1 pool / 23 hours = 1/23 pool per hour

combined rate = fill rate by pipe + fill rate by pool

= 1/15 + 1/23 = 38/345 pool per hour

since:

38/345 pool -----------> will take 1 hour

1 pool --------------------> will take 1 hour x (345/38) = 9.08 hours

4 0

3 years ago

Read 2 more answers

Sam bought 15 pies and 7 slices of cake for $55.25. If each pie cost 2/5 as much as a slice of cake, what was the total cost of

romanna [79]

Answer: $10.20

Step-by-step explanation:

Let's first collect the information from the word problem.

Bought 15 pies and 7 cake slices

Total cost was $55.22.
Pies cost $\frac{2}{5}$ as much as a slice of cake

<h3><em>We need to solve for:</em></h3>

Total cost of 1 pie and 2 cake slices

1. Create an equation/expression:

To solve the problem, we need to find the price of a pie and cake slice.

Using the information gathered, the equation is:

$55.25 = 7x+15(\frac{2}{5} x)$

<em>x = the cost of the slice of cake.</em>

<em />

2. Simplify/Solve

$55.25 = 7x+15(\frac{2}{5}x)\\55.25 = 7x+15*\frac{2}{5}*x\\55.25 = 7x+6x\\55.25 = 13x\\4.25 = x$

Great! we have the price of a slice of cake. ($4.25)

Remember that the pie is $\frac{2}{5}$ of a slice of cake, so now find the price of the pies.

Pie = $\frac{2}{5} 4.25$

Pie = $1.70

Awesome! We know a slice of cake costs $4.25 and a slice of pie costs $1.70.

3. Check your work!

<em>Check to make sure the math is done correctly!</em>

$55.25=7(4.25)+15(1.70) \\55.25=29.75+25.50\\55.25=55.25$

Good! It is verified that our calculations are correct.

4. Solve!

1 pie and 2 cakes cost: $1.70+2(4.25)$

$10.20 is our final answer!

Hope this helped!~~ -Astro

7 0

4 years ago

You but butter for $4.29 a pound. One portion of onion compote requires 1.7 oz of butter. How much does the butter for one porti

oksano4ka [1.4K]

Answer:

$7.29

Step-by-step explanation:

$4.29 per lb of butter

Need 1.7 lb of butter

4.29 · 1.7 = 7.293

≈$7.29

I hope this helps! :)

5 0

4 years ago

A probability distribution for a random variable Y is given by P(Y=y)=cy, for y=1,2,4,5 and c is a constant. Find E(Y), the expe

Dahasolnce [82]

Answer:

$c(1+2+4+5) =1$

$c =\frac{1}{12}$

Now we can find the expected value with this formula:

$E(Y) =\sum_{i=1}^n Y_i P(Y_i) =\sum_{i=1}^n cy_i *y_i = cy^2_i$

And replacing we got:

$E(Y) = \frac{1}{12} (1^2 + 2^2 + 4^2 +5^2) = \frac{46}{12}= \frac{23}{6}$

Step-by-step explanation:

For this case we know the following probability mass function given:

$P(y) = cy , y= 1,2,4,5$

For this case we need to satisfy the following condition in order to have a probability distribution function:

$\sum_{i=1}^n P(y_i) =1$

And we have this:

$c(1+2+4+5) =1$

$c =\frac{1}{12}$

Now we can find the expected value with this formula:

$E(Y) =\sum_{i=1}^n Y_i P(Y_i) =\sum_{i=1}^n cy_i *y_i = cy^2_i$

And replacing we got:

$E(Y) = \frac{1}{12} (1^2 + 2^2 + 4^2 +5^2) = \frac{46}{12}= \frac{23}{6}$

6 0

3 years ago