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Zina [86]
2 years ago
5

Write the expression two-cubed times seven as a numerical expression.

Mathematics
1 answer:
aleksley [76]2 years ago
4 0

Answer:

See below

Step-by-step explanation:

2^3    is   two cubed     ...now multiply times 7

<u>7 * 2^3    </u>

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A) If the 5th term of an A.P. is double the 7th term, show that the sum of the 17 terms zero.​
gayaneshka [121]

Answer:

see explanation

Step-by-step explanation:

The nth term of an AP is

a_{n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Given a₅ is double a₇ , then

a₁ + 4d = 2(a₁ + 6d) , that is

a₁ + 4d = 2a₁ + 12d ( subtract a₁ from both sides )

4d = a₁ + 12d ( subtract 12d from both sides )

- 8d = a₁

The sum of n terms of an AP is

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ] , substitute values

S_{17} = \frac{17}{2} ( 2(- 8d) + 16d)

     = 8.5(- 16d + 16d)

     = 8.5 × 0

     = 0

5 0
2 years ago
Please awnser asap<br> Factor out the trinomial 10x^2+3x-1?
g100num [7]

Answer- (5x-1)(2x+1)

let me know if you need to see work

8 0
3 years ago
Gretchen earns extra money mowing lawns on the weekend. She mows 3 lawns per hour and earns $12.00 per lawn. How much does Gretc
stepladder [879]

Gretchen will earn $48 from mowing in 4 hours

Data

  • Amount earned on each lawn = $12
  • Number of hours mowing = 4 hours

<h3>What is Rate</h3>

This is the measure of one unit against another unit. An example of this is speed which is the rate of distance covered to time.

In this case, she mows 1 lawn in each hour and earns $12 on each.

To calculate for 4 hours

4*12=$48

She earns $48 from mowing 4 lawns

learn more on rates here;

brainly.com/question/8728504

4 0
2 years ago
PLEASE HELP DUE TOMORROW
kow [346]
190-15=x
I believe?
I THINK THIS IS THE ANSWER
3 0
3 years ago
What is the answer to this fraction problem 4/5 - 8/15?
Marianna [84]
Is the answer to your question 4/15?
5 0
3 years ago
Read 2 more answers
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