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3 years ago

7

Kamal bought 7 7 packs of paper clips for a project. Then he bought 8 8 more packs. There are 25 25 paper clips in each pack. Ho

w many paper clips did he buy?

2 answers:

Anon25 [30]3 years ago

6 0

Hello, here is the answer!

Answer: 375

Step-by-step explanation: 7+8=15

15x25=375

375 paper clips

krek1111 [17]3 years ago

6 0

Answer:

375

Step-by-step explanation:

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Suppose there are two lakes located on a stream. Clean water flows into the first lake, then the water from the first lake flows

never [62]

Answer:

a. For the first lake;

c = (m·t - 0.005·m·t²)/100000

For the second tank, we have;

c = m·t/200 - m·t²/80000

b. t ≈ 1.00505 hours

c. 200 hours

Step-by-step explanation:

The flow rate of water in and out of the lakes = 500 liters/hour

The volume of water in the first lake = 100 thousand liters

The volume of water in the second lake = 200 thousand liters

The mass of toxic substances that entered into the first lake = 500 kg

The concentration of toxic substance in the first lake = m₁/(100000)

Therefore, we have;

The quantity of fresh water supplied at t hours = 500 × t

The change

The change in the mass of the toxic substance with time is given as follows

dm/dt = (m - m/100000 × 500 × t)/100000

c = (m·t - 0.005·m·t²)/100000

For the second tank, we have;

c = m/100000 × 500 × t - (m/100000 × 500 × t)/200000 × 500 × t

Using an online tool, we have;

c = m·t/200 - m·t²/80000

b. When c < 0.001 kg per liter, we have m < 0.001 × 100000, which gives m < 100

Substituting gives;

0.001 = (100·t - 0.005·100·t²)/100000, solving with an online tool, gives;

t ≈ 1.00505 hours

c. For maximum concentration, we have;

c = m·t/200 - m·t²/80000

m/200000 = m·t/200 - m·t²/80000

1/200000 = t/200 - t²/80000

dc/dt = d(t/200 - t²/80000)/dt = 0

Solving with an online tool gives t = 200 hours

6 0

3 years ago

What is The answer for number one?

maks197457 [2]

I think is 22
sorry if i'm wrong

4 0

3 years ago

PLSSS HELP, I need to figure out the answer to this with showing work included.

Dennis_Churaev [7]

Answer:

I hope this helps

Step-by-step explanation:

8 0

3 years ago

A study of 40 white mice

zmey [24]

Answer:

$3.20-1.304\frac{0.8}{\sqrt{40}}=3.035$

$3.20+1.304\frac{0.8}{\sqrt{40}}=3.365$

And the confidence interval would be between (3.035;3.365)

Step-by-step explanation:

Information given

$\bar X=3.20$ represent the sample mean

$\mu$ population mean (variable of interest)

s=0.8 represent the sample standard deviation

n=40 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom are given by:

$df=n-1=40-1=39$

The Confidence level is 0.80 or 80%, the significance would be $\alpha=0.2$ and $\alpha/2 =0.1$ , and the critical value would be $t_{\alpha/2}=1.304$

Now we have everything in order to replace into formula (1):

$3.20-1.304\frac{0.8}{\sqrt{40}}=3.035$

$3.20+1.304\frac{0.8}{\sqrt{40}}=3.365$

And the confidence interval would be between (3.035;3.365)

6 0

3 years ago

Dominique bikes 1/6 mile every day. How many days will it take her to bike 8 miles?

Bond [772]

1/6 of a mi - 1 day, 2/6 of a mi- 2 days, 3/6 of a mi- 3 days, 4/6 of a mi- 4 days, 5/6 of a mile - 5 days, 1 mile - 6 days, 1 1/6 mi - 7 days, 1 2/6 mi - 8 days , so on & so forth, do you understand ?

7 0

3 years ago

Read 2 more answers