MATHEMATICS HIGH SCHOOL

Ryan has some nickels and dimes. Altogether, he has 34 coins that total $2.60. Write the system of equations to determine how many of each coin he has.

Answers

Answer 1
Answer: 34= n+d
2.60=.05n+.1d
Answer 2
Answer: To find the amount of dimes that Ryan uses, I used (2.60/0.10) to get 26 dimes, meaning that there are also 8 nickels.

So in total, you have 26 dimes and 8 nickels

Hope this helps

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How many days are in 3 2/7 weeks

Answers

Well, there are 7 days in a week, so we'll have to multiply that by 3, which would be 21, plus the other 2 days stated in da problem, so that would be a total of 23 days!
I hope I helped, and PLEASE choose my answer as the Brainliest! 
Thank you! =D
7 × 3 = 21
21 + 2 = 23

So therefore, 23 days.

Simplify this expression.
2^5(13 +12)

Answers

Answer:

800

Step-by-step explanation:

You do 2 to the 5 power, which equals 32. Then add 13 and 12 to get 25. Then multiply 32 and 25 to get 800

Ahmad drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 8
hours. When Ahmad drove home, there was no traffic and the trip only took
5
hours. If his average rate was
21
miles per hour faster on the trip home, how far away does Ahmad live from the mountains?
Do not do any rounding.

Answers

55 miles from the mountains

Brandon buys a radio for 43.99 in a state where the sales tax is 7%

Answers

So then this is a simple multiplication problem. First, we need to make the percentage a decimal. To do that, we find out how many parts out of 100 it is. In this case it 7 parts, so we're making it the decimal .07. So the problem becomes 43.99x0.07. We multiply that, and come up with 3.0793. We'll round that to the hundredths place, and come up with 3.08. So on a radio that costs $43.99, you will pay $3.08 tax, bringing the total to $47.07.
43.99
Convert to a decimal. x .07
¯¯¯¯¯¯¯¯
3.0793
Add + 43.99
¯¯¯¯¯¯¯¯¯
47.0693
Round out. $47.07 is your answer

Which of the following is not equivalent to cos pi over 5 1. Cos negative pi over 5 2. Cos 9pi over 5 3. Cos 4 pi over 5 4. Cos 11 pi over 5

Answers

Answer:

The expression that is not equivalent to \cos ((\pi)/(5)) is:

                   3.   \cos((4\pi)/(5))

Step-by-step explanation:

We are asked to find which of the expression is not equivalent to:

                  \cos ((\pi)/(5))

1)

     \cos((-\pi)/(5))

We know that:

\cos(-\theta)=\cos(\theta)

Hence, we get:

\cos((-\pi)/(5))=\cos((\pi)/(5))

Hence, option: 1 is incorrect.

2)

            \cos((9\pi)/(5))

We know that:

\cos((9\pi)/(5))=\cos( 2\pi-(\pi)/(5))

As we know that:

\cos(2\pi-\theta)=\cos(\theta)

Hence, we have:

\cos((9\pi)/(5))=\cos((\pi)/(5))

Hence, option: 2 is incorrect.

4)

            \cos((11\pi)/(5))

We know that:

\cos((11\pi)/(5))=\cos( 2\pi+(\pi)/(5))

As we know that:

\cos(2\pi+\theta)=\cos(\theta)

Hence, we have:

\cos((11\pi)/(5))=\cos((\pi)/(5))

Hence, option: 4 is incorrect.    

3)

                 \cos((4\pi)/(5))

We know that:

\cos((4\pi)/(5))=\cos(\pi-(\pi)/(5))

As we know that:

\cos(\pi-\theta)=-\cos(\theta)

Hence, we have:

\cos((4\pi)/(5))=-\cos((\pi)/(5))\neq \cos ((\pi)/(5))

                Hence, option: 3 is the answer.
What is cos if u tell me i can answer

A scientist begins an experiment with a culture of 5 bacteria cells. Every hour, the number of bacteria cells triples. Which equation can be used to represent the number of bacteria cells, y, as it relates to time in hours, x?

Answers

Answer:

y = 5 * (3^x)

Step-by-step explanation:A scientist begins an experiment with a culture of 5 bacteria cells.

Every hour, the number of bacteria cells triples.

Which equation can be used to represent the number of bacteria cells, y, as it relates to time in hours, x?

:

I think it would be y = 5 * (3^x)

Answer:

y=5(3)^x

Step-by-step explanation: i just got it right on my test
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