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3 years ago

The temperature at 3:00 PM was 35°F. The

Mathematics

2 answers:

11Alexandr11 [23.1K]3 years ago

8 0

-10 degrees Fahrenheit

stiv31 [10]3 years ago

5 0

Answer:

- 10 degrees Fahrenheit at 9:00 PM

Step-by-step explanation:

35 - 45 = -10

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A bank sampled its customers to determine the proportion of customers who use their debit card at least once each month. A sampl

Zinaida [17]

Answer:

(0.084,0.396)

Step-by-step explanation:

The 99% confidence interval for the proportion of customers who use debit card monthly can be constructed as

$p-z_{\frac{\alpha }{2}} \sqrt{\frac{pq}{n} }$

$p=\frac{x}{n}$

$p=\frac{12}{50}$

$p=0.24$

$q=1-p=1-0.24=0.76$

$\frac{\alpha }{2} =\frac{\0.01 }{2}=0.005$

$p-z_{\frac{\alpha }{2}} \sqrt{\frac{pq}{n} }$

$0.24-z_{0.005} \sqrt{\frac{0.24*0.76}{50} }$

$0.24-2.58(0.0604)$

$0.24-0.155832$

By rounding to three decimal places we get,

$0.084$

The 99% confidence interval for the proportion of customers who use debit card monthly is (0.084,0.396).

3 0

3 years ago

a garden plot is to contain 240 sq. ft. if its length is to be 3 times its width,what should its dimensions be?

SOVA2 [1]

240 ft^2 = L X W
240 = 3W x W
240 = 3W^2
W = 8.94427 ft
L = 3W = 3(8.94427)
L = 26.8328 FT

8 0

3 years ago

Evaluate 15/k when k=3

iVinArrow [24]

Answer:

Step-by-step explanation:

K equals 3 and so 15/3 equals 5.

7 0

3 years ago

Read 2 more answers

Yuri surveyed a random sample of 75 students in his school about their favorite color. Of the students surveyed, 49 chose lavend

anastassius [24]

Answer:

600

Step-by-step explanation:

Take the number that answered lavender and divide by total # of students surveyed

49/75 = .653333 or 65.3%

then take the total # of students and multiply by .6533333

908x .6533333 = 593.22

so the closest estimate is 600

-- Gage Millar, Algebra 1/2 tutor

5 0

3 years ago

What is the inverse of f(x)= 3x-9

JulsSmile [24]

If $f^{-1}(x)$ is the inverse of $f(x)$ , then

$f\left(f^{-1}(x)\right) = x$

Given

$f(x) = 3x-9$

composing with the inverse function gives

$f\left(f^{-1}(x)\right) = 3f^{-1}(x) - 9 = x$

Solve for the inverse:

$3f^{-1}(x)-9 = x \\\\ 3f^{-1}(x) = x+9 \\\\ \boxed{f^{-1}(x) = \dfrac x3 + 3}$

5 0

3 years ago