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tester [92]
3 years ago
11

Justin has only nickels and quarters in his piggy bank he’s 49 coins total for combined value of $8.85 how many of each type of

coin does he have
Mathematics
1 answer:
Pavlova-9 [17]3 years ago
8 0
17 nickels and 32 quarter.

Here's my work!

x = nickels
y = quarters

x + y = 49

.05x + .25y = 8.85

x + y = 49. = y= -x + 49

.05x +.25( -x + 49 ) = 8.85
.05x + -.25x + 12.25 = 8.85
-.2x + 12.25 = 8.85
- 12.25. -12.25

-.2x = -3.4
÷-.2x. ÷-.2x
x=17

x + y = 49
17 + y = 49
-17. -17

y=32

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Mekhanik [1.2K]

Answer:

5005

Step-by-step explanation:

6 C 15

(6, 15)

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The answer is 5005

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6 0
3 years ago
The net worthw(t) of a company is growing at a rate of′(t) = 2000−121t2dollarsper year, wheretis in years since 1990.(a) If the
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Answer:

The worth of the company in 2000 is $56,000.

Step-by-step explanation:

The growth rate of the company is:

f'(t)=2000-12t^{2}

To determine the worth of the company in 2000, first compute the change in the net worth during the period 1990 (<em>t</em> = 0) to 2000 (<em>t</em> = 10) as follows:

\int\limits^{10}_{0} {2000-12t^{2}} \, dt =\int\limits^{10}_{0} {2000} \, dt-12\int\limits^{10}_{0} {t^{2}} \, dt=2000 |t|^{10}_{0}-12|\frac{t^{3}}{3}|^{10}_{0}\\=(2000\times10)-(4\times10^{3})\\=20000-4000\\=16000

The increase in the company's net worth from 1990 to 2000 is $16,000.

If the company's worth was $40,000 in 1990 then the worth of the company in 2000 is:

Worth in 2000 = Worth in 1990 + Net increase in company's worth

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Thus, the worth of the company in 2000 is $56,000.

4 0
3 years ago
September 6 is a Read Book Day.Polina read 5 times as many pages as Marcus read.Together,the read 108 pages.How many pages did e
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Answer:

The number of pages that Polina read was 90 and the number of pages that Marcus read was 18

Step-by-step explanation:

Let

x -----> number of pages that Polina read

y ----> number of pages that Marcus read

we know that

x+y=108 ----> equation A

x=5y -----> equation B

substitute equation B in equation A and solve for y

5y+y=108\\6y=108\\y=18

Find the value of x

x=5y -----> x=5(18)=90

therefore

The number of pages that Polina read was 90 and the number of pages that Marcus read was 18

3 0
3 years ago
What is the value of x?<br><br><br><br> Enter your answer in the box.<br><br> °
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Answer:

The answer to your question is:  111°

Step-by-step explanation:

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This polygon has 7 sides

Then n = 7

Process

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Answer:

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