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shusha [124]
3 years ago
6

What is the slope of the line through (-1,8) and (3,-4) ?

Mathematics
1 answer:
Flauer [41]3 years ago
7 0

Answer:

m  = −3

Step-by-step explanation:

Use the slope formula to find the slope  m .

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At an appliance store, the price of a refrigerator is marked up 25% to $406.25.
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$325

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Express (13/15 - 7/10) as a percentage​
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Answer:

(13/15 - 7/10)

take lcm

<u>13*2 - 7*3</u>    = 5/30*100= 50/3%

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3 years ago
The student council has 10 members where 5 of the members are Seniors. They need to choose a President, Vice President, Secretar
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Answer:

P=1/42.

Step-by-step explanation:

We know that the student council has 10 members where 5 of the members are Seniors. They need to choose a President, Vice President, Secretary and Treasurer. We calculate the probability that the President is a Senior:

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3 years ago
The cost of 4 pounds of bananas is $1.88. What is the constant of proportionality that relates the cost in dollars, y, to the nu
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5 0
3 years ago
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A researcher wishes to​ estimate, with 99​% ​confidence, the population proportion of adults who think the president of their co
scoray [572]

Answer:

a. n=4148

b. n=3909

c. The sample size is smaller if a known proportion from prior study is used. The difference in sample sizes is 239

Step-by-step explanation:

a. For sample where no preliminary estimate is given, the minimum sample size is calculated using the formula:

n=p(1-p)(\frac{z}{ME})^2

Where:

  • ME=Margin of error
  • p= is the assumed proportion

#Let p=0.5, substitute in the formula to solve for n:

n=0.5(1-0.5)\times (2.576/0.02)^2\\\\=4147.36\approx 4148

Hence, the minimum sample size is 4148

b. If given a preliminary estimate p=0.38, we use the same formula but substitute p with the given value:

n=p(1-p)(z/ME)^2\\\\=0.38(1-0.38)(2.576/0.02)^2\\\\=3908.47\approx3909

Hence, the minimum sample size is 3909

c. Comparing the sample sizes from a and b:

n_{0.5}>n_{0.38}\\\\n_{0.5}-n_{0.38}=4148-3909=239

Hence, the actual sample size is smaller for a known proportion from prior a prior study.

8 0
3 years ago
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