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Soloha48 [4]
2 years ago
10

Find the first three terms of the arithmetic series described. a_1=1,a_n=19,S_n=100

Mathematics
1 answer:
Rudik [331]2 years ago
3 0

Answer:

1, 3, 5

Step-by-step explanation:

The sum of an arithmetic series is:

S_n = n (a_1 + a_n) / 2

100 = n (1 + 19) / 2

n = 10

The nth term of an arithmetic sequence is:

a_n = a_1 + d (n − 1)

19 = 1 + d (10 − 1)

d = 2

The common difference is 2.  So the first three terms are 1, 3, and 5.

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The answer is 224.7 you got to turn 30% into decimal which is 0.30 
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A group of 55 football players were polled about which synthetic grass they like to play on, Chemstrand or Chemgrass. The data f
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6 0
2 years ago
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A. If a spacecraft was parked on Venus and needed to make a flight to Jupiter, how far would it need to travel? Show your work a
bija089 [108]
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10 {}^{8}


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C.If Earth was 10 times farther away from the sun than it is now, which planet would it be closest to? (Assume all the planets are aligned with the sun and are on the same side of the sun.) Compare Earth's new distance to that planet. How far apart would they be in standard notation? How far apart in scientific notation? Show your work. Earth = 149,600,000 km 149,600,000 x 10 = 1,496,000,000 Earth’s new distance = 1,496,000,000 Earth would be closest to Saturn. 1,496,000,000 – 1,429,000,000 = 67,000,000
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D. The space shuttle travels at about 28,000 km per hour. Using that information, estimate how many hours it will take the shuttle to reach Saturn from Earth. (Assume both planets are aligned with the sun and are on the same side of the sun.) Show your work. Convert your answer into scientific notation if necessary. Earth = 149,600,000 km
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(same with this one, it should be written as I have it shown below instead of how I first tried to explain it.)
10 {}^{4}






4 0
2 years ago
At a local shelter large dogs can be adopted for $10 each.Small dogs can be adopted for $5 each.There are 17 large dogs availabl
miskamm [114]
You first want to make the word problem into equations!

Let x represent large dogs
Let y represent small dogs.

10x+5y=215

And now since you are given the value of x / the number of dogs you can solve by subbing this value into the equation.

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So as you can see there are 9 small dogs at the shelter!

Explanation #2 

In the word problem you can see that it tells you that there is 17 large dogs. It also tells you that in total all the dogs (so large and small) will be $215. It also says the prices of the dogs!

So what you know is : 17 large dogs, $215 total, $5 for a small dog, $10 for a large dog!

In order to figure out how many small dogs are at the shelter you will need to make this information into an equation!

Since it is 10/ large dog this is 10x
Since it is 5/small dog this is 5y

So now you know that 10x+5y=215

Since you are given the # of large dogs, you can put in that number for x

10(17)+5y=215  

170+5y=215   Step 1) Multiply 10 x 17
5y=215-170    Step 2) Move everything without a letter to one side
5y/5=45/5       Step 3) Divide by 5 (Both sides!) to get the y all alone
y=9                 Step 4) All done!






8 0
2 years ago
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