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ale4655 [162]
3 years ago
7

Need help with questions 18,20, and 22 please and thank you

Mathematics
1 answer:
Tatiana [17]3 years ago
6 0

Answer:

18. x² + x - 4

20.  \frac{x^{2} +2x-3}{x+1} or  x + 1 - \frac{4}{x+1}

22. x² + 2x - 2

Step-by-step explanation:

For some reason my work was unable to be submitted so please see attachment for detailed explanation

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I am not sure how sigma notation works, can somebody explain how to solve this? It isn't the second choice.
Masja [62]

Answer:

first answer is correct

Step-by-step explanation:

Hello, we want to write 2 + 4 + 6 + ... + 20

for n = 1, 2n = 2*1 =2

for n = 2, 2n = 2*2=4

for n = 3, 2n=2*3=6

etc

so

\displaystyle \sum_{n=1}^{10} {2n} = 2*1 + 2*2 +2*3+2*4+...+2*10=2+4+6+8+...+20

thanks

6 0
2 years ago
Helppppppppppppppppppppppp
8_murik_8 [283]

$138.00

Step-by-step explanation:

Steven earns in 4 hours -$23.00

he earns in 6 hours-$34.50

there fore in 10 hours -23.00+34.50=$57.50

in 20 hours -57.50+57.50=$115

and in 4 hours-$23.00+115.00=138.00$

then he earn $138.00 one day

8 0
2 years ago
SOLVE FOR X please help !!!!!!!!!!!
Julli [10]

think of it as half a circle which all equals up to 180 degrees

subtract 180 degrees with 62 degrees which 62 degrees is in the problem.

180-62=118 degrees

so your answer is C) 118 degrees

hope that helped you out:)

Please mark my answer brainiest

8 0
2 years ago
A count went from 605 to 203. What was the approximate percent decrease? Round the numbers to find an estimate of the percent de
topjm [15]

Answer:

66%

Step-by-step explanation:

5 0
2 years ago
an object that weighs 1 pound on earth weighs 1.19 pounds on neptune suppose a dog weighs 9 pounds on earth how much would the s
grigory [225]
9x1.19=10.71

This means the dog weighs 10.71 pounds, hope this helps
8 0
2 years ago
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