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Sonja [21]
3 years ago
6

Need help please ASAP

Mathematics
2 answers:
aivan3 [116]3 years ago
7 0

Answer:

B.)8ft

Step-by-step explanation:

Set up a proportional to the roof slope:

2/5 = x/20

Cross multiply:

40/5 = 5x/5

x=8ft

SVETLANKA909090 [29]3 years ago
6 0

Answer: B) 8 ft

Step-by-step explanation:

\frac{2}{5}*\frac{4}{4} =\frac{8}{20}

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svet-max [94.6K]

Answer Z = -1/4

Step-by-step explanation:

-1/3+2z= -5/6

Add 1/3 to both sides

-1/3+2z+1/3 = -5/6+1/3

Simplify

2z=-1/2

Divide both sides by 2

2z/2 = -1/2/2

Simplify

z = -1/4

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3 years ago
Arrange from shortest to longest. 3/8, 3/6, 3/4.
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Answer: it already is.

Step-by-step explanation: The more pieces are cut, the smaller they get so the bigger the denominator, the bigger the piece

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3 years ago
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You are going shopping for school supplies. Between what you have saved and what you have been given, you have $300 to use to bu
nydimaria [60]

Answer:

Step-by-step explanation:

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3 years ago
A recent study asked U. S. Adults to name 10 historic events that occurred during their lifetime that have had the greatest impa
Nadusha1986 [10]

Using the z-distribution, as we are working with a proportion, it is found that the 99% confidence interval for the proportion of all U. S. Adults who would include the 9/11 attacks on their list of 10 historic events is (0.7458, 0.7942). It means that we are 99% sure that the true proportion for all U.S. adults is between these two bounds.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which:

  • \pi is the sample proportion.
  • z is the critical value.
  • n is the sample size.

In this problem, the parameters are:

z = 2.575, n = 2000, \pi = 0.77

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.77 - 2.575\sqrt{\frac{0.77(0.23)}{2000}} = 0.7458

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.77 + 2.575\sqrt{\frac{0.77(0.23)}{2000}} = 0.7942

The 99% confidence interval for the proportion of all U. S. Adults who would include the 9/11 attacks on their list of 10 historic events is (0.7458, 0.7942). It means that we are 99% sure that the true proportion for all U.S. adults is between these two bounds.

More can be learned about the z-distribution at brainly.com/question/25890103

7 0
2 years ago
Simplify the expression: 2(2 + g) =
Over [174]

Answer:

4 + 2g

General Formulas and Concepts:

<u>Pre-Algebra</u>

Distributive Property

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Step-by-step explanation:

<u>Step 1: Define</u>

2(2 + g)

<u>Step 2: Expand</u>

  1. Distribute 2:                     2(2) + 2(g)
  2. Multiply:                           4 + 2g
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3 years ago
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