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3 years ago

The functions r and s are defined as follows.

Mathematics

1 answer:

yawa3891 [41]3 years ago

8 0

$r(s(x))=2(-2x^2+2)+2=-4x^2+4+2=-4x^2+6\\\\ r(s(-2))=-4\cdot(-2)^2+6\\ r(s(-2))=-4\cdot4+6\\ r(s(-2))=-10$

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Sand and gravel are mixed in the ratio 5:3 to form ballast.

r-ruslan [8.4K]

<h3>Answer: 1250 kg of sand</h3>

Work Shown:

sand/gravel = 5/3

x/750 = 5/3

3x = 750*5

3x = 3750

x = 3750/3

x = 1250

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2 years ago

Formula of circumference

Korvikt [17]

Answer:

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3 years ago

Read 2 more answers

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vampirchik [111]

8/11 is the answer

I use this trick: When tryig to find repeating numbers divide by 11 or 9

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3 years ago

Over the past several months,the water level of a lake has been decreasing by 12% each week.If the highest water level before th

pickupchik [31]

Answer:

The level was 402.7ft. at the end of two weeks.

Step-by-step explanation:

First, we need to find the amount of decrease for the first week.

520 x 0.12 = 62.4

Now, we subtract the change for the first week.

520 - 62.4 = 457.6

Next, we find the change for the second week.

457.6 x 0.12 = 54.912

Then, we subtract the change for the second week.

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8 0

3 years ago

Last year the schools newspaper so if full page ad for $16.50 each of H half page is $9.60 each day school they plan to increase

erica [24]

Question isn't well formatted, however. From what can be gathered form the question :

Options are given

Answer:

4(1.5 * 16.50) + (1.5 * 9.60)

$113.40

Step-by-step explanation:

Last year:

Cost of full page ad = $16.50

Cost of half page ad = $9.60

50% increase in ad price this year :

Price, this year :

Full page = 1.50 * 16. 50 = $24.75

Half page = 1.50 * $9.60 = $14.4

Expression :

4(1.5 * 16.50) + (1.5 * 9.60)

Cost of a 4 and 1/2 page ad :

Full page = 4 * $24.75 = $99

Half page = 1 * $14.4 = $14.40

Total cost = $(99 + 14.40) = $113.40

8 0

3 years ago