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Stella [2.4K]
3 years ago
7

The bottom one says 9/2 so please help with these questions, I have more on my profile.

Mathematics
1 answer:
eimsori [14]3 years ago
7 0

18. Solve for x by factoring diamond method

10x^2 - 29x - 21 = 0 becomes

(2x - 7)(5x + 3) = 0

x = 7/2, -3/5

A

19. To model this we will do

(x + 9)(x + 9) = 169

distribute

x^2 + 18x - 88 = 0

factor

(x - 4)(x + 22) = 0

The length is 4m

D

20. This can be modeled by

(l)(l +5) = 234

distribute

l^2 + 5l -234 = 0

factor

(l-13)(l+18) = 0

The length is 13

The width is 18

B

21. To find this you divide the x term by 2 and square it so

10/2 = 5

5^2

25

B

22. To find this you divide the x term by 2 and square it so

9/2 = 4.5

4.5^2

81/4

C




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Answer:

[-5, 4) ∪ (4, ∞)

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Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively.
TiliK225 [7]

Answer:

d. 200 and 2

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

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