3 years ago

PLEASE HELP

Mathematics

2 answers:

balandron [24]3 years ago

5 0

Answer:

can I answer your question in comment box

tigry1 [53]3 years ago

3 0

Answer:

can I answer your question in comment box

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What is the intermediate step in the form (x + a)2 = b as a result of completing the

Eddi Din [679]

Answer:

(x + 7)^2 = 64

Step-by-step explanation:

x^2 + 23x – 19 = 9x - 4

x^2 + 23x - 9x = -4 + 19

x^2 + 14x = 15 = 0

Completing the square:

(x + 14/2)^2 - (14/2)^2 = 15

(x + 7)^2 - 49 = 15

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3 years ago

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Oksi-84 [34.3K]

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3 years ago

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2 years ago

The American Water Works Association reports that the per capita water use in a single-family home is 74 gallons per day. Legacy

Lunna [17]

Answer:

Reject H0 since test statistic <-2.492

Step-by-step explanation:

Given that the American Water Works Association reports that the per capita water use in a single-family home is 74 gallons per day.

n = 25

x bar = 69

s= 8.3

std error = s/sqrt n = $\frac{8.3}{5} \\=1.66$

H0: $\bar x = 74$

Ha: $\bar x$

(Left tailed test at 5% significance level)

a) Reject H0 if t $\leq$ -2.492

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= $\frac{69-74}{1.66} \\=-3.012\\$

=-3.01

df =24

c) Reject H0

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3 years ago