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tekilochka [14]
2 years ago
12

What is the area of the triangle?

Mathematics
1 answer:
Elden [556K]2 years ago
7 0

Answer:

1.A. 75 m sq

2.D. 67.5 m sq

3.C. 210 m sq

Step-by-step explanation:

no step by step

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Find the sum of the first 20 terms of an arithmetic sequence with an 18th term of 8.1 and a common difference of 0.25.
il63 [147K]

The sum of the first 20 terms of an arithmetic sequence with the 18th term of 8.1 and a common difference of 0.25 is 124.5

Given,

18th term of an arithmetic sequence = 8.1

Common difference = d = 0.25.

<h3>What is an arithmetic sequence?</h3>

The sequence in which the difference between the consecutive term is constant.

The nth term is denoted by:

a_n = a + ( n - 1 ) d

The sum of an arithmetic sequence:

S_n = n/2 [ 2a + ( n - 1 ) d ]

Find the 18th term of the sequence.

18th term = 8.1

d = 0.25

8.1 = a + ( 18 - 1 ) 0.25

8.1 = a + 17 x 0.25

8.1 = a + 4.25

a = 8.1 - 4.25

a = 3.85

Find the sum of 20 terms.

S_20 = 20 / 2 [ 2 x 3.85 + ( 20 - 1 ) 0.25 ]

         = 10 [ 7.7 + 19 x 0.25 ]

         = 10 [ 7.7 + 4.75 ]

         = 10 x 12.45

         = 124.5

Thus the sum of the first 20 terms of an arithmetic sequence with the 18th term of 8.1 and a common difference of 0.25 is 124.5

Learn more about arithmetic sequence here:

brainly.com/question/25749583

#SPJ1

8 0
1 year ago
Find the solution(s) to the equation below. Select all that apply. x2−6=5x
BaLLatris [955]

Answer:

x2-6=5x

10x=5x

50x-6=44x

5 0
2 years ago
Who was targeted by the crusaders wh ile heading to constantinople​
Likurg_2 [28]

Answer:

I believe Jerusalem was captured

3 0
3 years ago
The expression cos(A-B) - cos(A+B) is equal to
olchik [2.2K]
Cos (A-B) - cos (A+B) 
= (cosAcosB +sinAsinB) - (cosAcosB - sinAsinB)
=2sinAsinB

Ans: 4
6 0
2 years ago
Read 2 more answers
If you subtract 12 from my number and multiply the difference by - 5, the result is -90." What is Sara's number?​
Natali [406]

Answer:

30

Step-by-step explanation:

Do the steps in reverse

-90 divided by -5 = 18

18 + 12 = 30

Your answer is 30

Hope I helped :)

Please consider Brainliest :)

5 0
3 years ago
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