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faltersainse [42]
3 years ago
8

Find the 20th term of the arithmetic sequence 7, 3, -1, -5, …

Mathematics
1 answer:
allsm [11]3 years ago
7 0
7, 3,-1,-5
decreased by 4 each time
arthymetic
an=a1+d(n-1)
a1=first term
d=common diffrence
n=which term

first term is 7
common difference is -4
an=7-4(n-1)
for 20th term
a20=7-4(20-1)
a20=7-4(19)
a20=7-76
a20=-69

answer is B
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2 You hang two strands of Decorative light strand one change color every 30 seconds straight to change every 45 seconds both str
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The two strands of Decorative light will shine at same time after every 15 seconds.

<h3>What is defined as the Highest common factor?</h3>
  • The greatest of all their common factors is the Highest Common Factor (HCF) of more than one number.
  • As a result, it is also known as the greatest common factor (GCF).
  • There isn't an exact formula for determining the greatest common factor of two numbers.
  • However, when considering prime factorization, we can write a statement that aids in evaluating the greatest common factor of more than one number.

The stated condition are-

The light strand one change color every 30 seconds.

The light strand second change color every 45 seconds.

Prime factorization of both number are;

30 = 2×3×5

45 = 3×3×5

The numbers with highest power are;

HCF(30, 45) = 3×5 = 15.

Thus, the time after which both the light strands will change colour at the same time is 15 seconds.

To know more about Highest common factor, here

brainly.com/question/219464

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8 0
1 year ago
I am stuck on this one and its due tomorrow! Please help
marysya [2.9K]
I believe the error she made was adding it or multipulcation
8 0
3 years ago
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klemol [59]
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6 0
3 years ago
Help me please<br>I want the step by step explanation!!​
DiKsa [7]

Answer: AB=√17, AD=√98,6

Step-by-step explanation:

AB²=BC²+AC²-2*BC*AC*cosACB

AB²=5²+4²-2*5*4*0,6=25+16-24=17

AB=√17

AD²=AC²+CD²-2*AC*CD*cosACD

cosACD=cos(180°-ACB)=-cosACB

AD²=4²+7²-2*4*7*(-0,6)=16+49+33,6=98,6

AD=√98,6

4 0
3 years ago
Read 2 more answers
Analyze the problem and complete the statements.
NARA [144]

Answer:

I know this problem is an  

✔ equation

because it has an equals sign.

The t is the  

✔ variable

.

The negative sign is the  

✔ operation

.

The 7 and the 8 are both  

✔ constants

.

Step-by-step explanation: i took the test :( crying cuz im bouta fail

6 0
3 years ago
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