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Blizzard [7]
3 years ago
11

Which factoring method would be best to factor x^2 - 9?

Mathematics
1 answer:
Vinil7 [7]3 years ago
8 0

Answer:

  D.  difference of squares

Step-by-step explanation:

Both of the terms x^2 and 9 are squares, so their difference is the difference of squares. The factorization of that is a "special form" that can be usefully memorized.

  a^2 -b^2 = (a -b)(a +b)

  x^2 -9 = (x -3)(x +3)

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Find the 5th term of the sequence in which T1=8 and Tn=3t n-1
yan [13]
T_n = 3 * T_(n-1)

Long way (always works!)
T_5 = 3*T_4,
T_4 = 3*T_3
T_3 = 3*T_2
T_2 = 3*T_1

T_5 = 3*3*3*3*T_1 = 81*T_1 = 81*8 = 648!

Short way (sometimes it works!)

T_n = 3^(n-1) * T_1 (this case is a geometric series of ratio-=3)
T_5 = 3^4*8 = 648
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3 years ago
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Answer:

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Step-by-step explanation:

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Yuki888 [10]
The correct answer is:
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3 years ago
in the coordinate plane, line m had a slope of 1/4 and a y-intercept of (0,-3). line n is the result of dialating line m by a sc
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4 0
3 years ago
A community is considering raising funds to pay for improvements to the community swimming pool. To measure
Dennis_Churaev [7]

Using sampling concepts, it is found that the correct option is:

This is a convenience sample and likely overestimates support for raising funds.

<h3>How are samples classified?</h3>

Samples may be classified as:

  • Convenient: Drawn from a conveniently available pool.
  • Random: All the options into a hat and drawn some of them.
  • Systematic: Every kth element is taken.
  • Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.
  • Stratified: Also divides the population into groups. Then, a equal proportion of each group is surveyed.

In this problem, people at the pool were surveyed, hence it is a convenience sampling.

Also, since it only involved pool users, the proportion may be overestimated, hence the correct option is:

This is a convenience sample and likely overestimates support for raising funds.

More can be learned about sampling concepts at brainly.com/question/25122507

7 0
2 years ago
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