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Vika [28.1K]
3 years ago
6

Can you help solve for x in these three problems?

Mathematics
1 answer:
Karo-lina-s [1.5K]3 years ago
8 0

Answer:

19) 4   21) 8   23) 6.31

Step-by-step explanation:

23) -1 +14x + 12x +17 = 180

26x+16=180

26x=164

x= about 6.31

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What is the answer to this problem?​
olga55 [171]

Answer:

<h2>48</h2>

Step-by-step explanation:

It's an arithmetic sequence with common difference <em>d = 7</em>.

a_1=-8\\\\a_2=-8+7=-1\\\\a_3=-1+7=6\\\\a_4=6+7=13

Find 9th term.

METHOD 1<em>.</em>

<em>Calculate next terms:</em>

a_5=13+7=20\\\\a_6=20+7=27\\\\a_7=27+7=34\\\\a_8=34+7=41\\\\a_9=41+7=48

METHOD 2.

<em>The explicit formula of an arithmetic sequence:</em>

a_n=a_1+(n-1)d

Substitue:

a_n=-8+(n-1)(7)          <em>use the distributive property</em>

a_n=-8+7n-7\\\\a_n=7n-15

Put <em>n = 9</em>:

a_9=7(9)-15=63-15=48

7 0
3 years ago
PLEASE HELP I REALLY NEED A GOOD GRADE
Slav-nsk [51]

Answer:

For #2 "Parallel" For #3  "Infinitely many"

Step-by-step explanation:

3 0
3 years ago
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A roller coaster travels 3/4 of a mile in 40 seconds .what is the average speed in miles per hour​
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Answer:

0.01875 miles per hour

Step-by-step explanation:

0.75 divided 40

0.01875

6 0
4 years ago
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ivanzaharov [21]
1: answer is 28% of her money
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Alenkasestr [34]

Answer:

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Step-by-step explanation:

JL is the sum of JM and LM

JL = 5x-8 + 2x-6

Combine like terms

JL = 7x -14

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3 years ago
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