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3 years ago

Kevin drove 22 1/2 miles in 1/3 hour. What was his average speed in miles per hour

1 answer:

8 0

Answer=67.5 mph

22 1/2 miles 1/3hours

(22 1/2)/(1/3)=67.5miles per hour

____________________________
another way to solve this would be....

1/3 1
_______=________
22 1/2 x

cross multiply
(1/3)x=22 1/2
divide both sides by 1/3
x=67.5miles per hour

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Gary is studying the prevalence of regional dialects. He surveyed 351 people in a region and asked what words they used for cert

chubhunter [2.5K]

Answer:

Confidence interval = ( 0.7991, 0.8647 )

Step-by-step explanation:

Sample size = n = 351

number of successes = X = 292

Sample proportion = P = $\frac{X}{n}$

= $\frac{292}{351}$

= 0.831908831

confidence interval = 90%

Critical Z value = 1.6449 [by using excel]

Confidence interval = P ± Z $\sqrt{P\frac{(1-P)}{n}}$

Where P = Sample proportion

Z = critical value

n = sample size

Confidence interval = 0.831908831 ± 1.6449 $\sqrt{0.831908831\frac{(1-0.831908831)}{351}}$

= 0.831908831 ± 1.6449 × 0.0200

= 0.831908831 ± 0.032898

Lower limit = 0.831908831 - 0.032898 = 0.7991

Upper limit = 0.831908831 + 0.032898 = 0.8647

Confidence interval = ( 0.7991, 0.8647 )

4 0

3 years ago

what is an coefficient? I bet you guys on here could explain it better and how do I find out what the coefficients are?

wel

Answer: 3 and 19

Whoops, I'm a bit rusty, but numbers are also terms. Hope that also helps.

3 0

3 years ago

PLEASE HELP MEEE ILL MARK BRAINLIEST

kolezko [41]

Answer:

216 cu. ft.

Step-by-step explanation:

V = 1/2 x b x h x l

= 1/2 x 12 x 2 x 18

= 12 x 18

= 216 cu. ft.

6 0

2 years ago

Read 2 more answers

Write an equation of the line that is perpendicular to 5x+20y=10 and passes through the point (8,3)

natali 33 [55]

Y = 32x - 29

You can get this by solving for slope intercept form and then taking the opposite and recipricol of the slope. Solve the rest using point-slope form.

5 0

3 years ago

Simplify -12+8+5+(-9)

Zinaida [17]

FIRST Remove parentheses.
−12+8+5-9

Simplify -12+8 to -4

-4 + 5 — 9

Simplify
−4 + 5 −4+5 to 1
1 — 9

Simplify

-8 is your answer

3 0

3 years ago

Read 2 more answers