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2 years ago

9

Collin is making a bulletin board and note center. He is using square cork tiles and square dry-erase tiles. One of every 3 squa

res will be a cork square. If he uses 12 squares for the center, how many will be cork squares?

1 answer:

Lisa [10]2 years ago

5 0

Well 12 divided by 3 is 4 so there will be 4 cork squares.

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20×9×5 distributive property

Katena32 [7]

20times 9 times 5 is 900

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2 years ago

Read 2 more answers

In an experiment, fis the control variable, g is the response variable, and h

erik [133]

It’s B. k. If you think about it and try to solve it in a notebook you’ll get the answer. Hope this helps

3 0

2 years ago

+Brainliest for this one, pts stay 10. Good luck :)

Anon25 [30]

Answer:

7.25 × 10^6

Step-by-step explanation:

1) put into standard form: 6,000,000 + 1,250,000

2) add: 6,000,000 + 1,250,000= 7,250,000

3) put into scientific notation: 7.25 × 10^6

8 0

3 years ago

Newton's law of cooling is:

Mnenie [13.5K]

Answer:

$t = \frac{ln(\frac{21}{59})}{-0.15}=6.887 hr$

So it would takes approximately 6.9 hours to reach 32 F.

Step-by-step explanation:

For this case we have the following differential equationÑ

$\frac{du}{dt}= -k (u-T)$

We can reorder the expression like this:

$\frac{du}{u-T} = -k dt$

We can use the substitution $w = u-T$ and $dw =du$ so then we have:

$\frac{dw}{w} =-k dt$

IF we integrate both sides we got:

$ln |w| = -kt +C$

If we apply exponential in both sides we got:

$w = e^{-kt} *e^c$

And if we replace w = u-T we got:

$u(t)= T + C_1 e^{-kt}$

We can also express the solution in the following terms:

$u(t) = (T_i -T_{amb}) e^{kt} +T_{amb}$

For this case we know that $k =-0.15 hr$ since w ehave a cooloing, $T_{i}= 70 F, T_{amb}=11F$ , we have this model:

$u(t) = (70-11) e^{-0.15t} +11$

And if we want that the temperature would be 32F we can solve for t like this:

$32 = 59 e^{-0.15 t} +11$

$21=59 e^{-0.15 t}$

$\frac{21}{59} = e^{-0.15 t}$

If we apply natural logs on both sides we got:

$ln (\frac{21}{59}) =-0.15 t$

$t = \frac{ln(\frac{21}{59})}{-0.15}=6.887 hr$

So it would takes approximately 6.9 hours to reach 32 F.

7 0

3 years ago

How many times can 1000000000000 go into 10

makkiz [27]

Answer:

10 million (10,000,000) tens can go into 100,000,000

Step-by-step explanation:

4 0

2 years ago