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zysi [14]
3 years ago
10

Multiply -1/2 c(4c -2) Please ASAP

Mathematics
1 answer:
nalin [4]3 years ago
5 0

Answer:

-2c^2 + c

Step-by-step explanation:

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If the ratio of circles to triangles you will only need to write ratios in one form of your choice
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Ratio of area of circles: = πr2 :πc2 = πr2 :π r2 4 = 4 :1. 1. The small equilateral triangle is rotated through 60° about O, the center of the circle. The arm of the rotation is the radius of the circle

Step-by-step explanation:

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Which decimal is between √ 85 and √ 86<br><br>a)9.15<br>b)9.2<br>c)9.25<br>d)9.3​
mina [271]

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c

Step-by-step explanation:

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3 years ago
The cost of a fridge has increased by 15% to £828 <br> Work out the original price
Afina-wow [57]
Muliply .15 to 828 and get your answer the add it to 828

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3 years ago
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A researcher is going to estimate the average typing speed of students of a college. He selects a random sample of 20 students a
Stella [2.4K]

Answer:

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 20 - 1 = 19

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.7291

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample. For this question, we have s = 5, n = 20. So

M = T\frac{s}{\sqrt{n}}

M = 1.7291\frac{5}{\sqrt{20}}

M = 1.933

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

8 0
3 years ago
What is 9(x + 8) + x(5+4)
lina2011 [118]

Answer:

72+ 18x

Step-by-step explanation:

9x+72+5x+4x

72+ 18x

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3 years ago
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