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3 years ago

Im confused on this question khan academy

Mathematics

1 answer:

Anuta_ua [19.1K]3 years ago

8 0

A is 6, a = 6

b = -1 - 7a

b = -1 - 7(6)

b = -1 - 42

b = -43

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You read 50 pages in an hour. Your sister reads 40 pages in an hour. Explain how to find out how many more pages you read than y

devlian [24]

Since 1/2 is equal to a half, you divide 50 and 40 by 2 and you'll get 25 and 20 and then you subtract 25 and 20 and you get 5 which is the answer!

6 0

4 years ago

Read 2 more answers

The volume of an ice cream cone is 500cm^3. The height of the cone is 16cm. What is the approximate diameter of the base of the

olga55 [171]

Volume = πr²h/3
Here, V = 500
h = 16

Substitute their values,
500 = r² * 22/7 * 16/3
500 = r² * 352/21
r² = 500*21 / 353
r² = 10500 / 353
r² = 29.74
r = √29.74
r = 5.45

Now, diameter = 2 * radius = 2 * 5.45 = 10.90 cm

So, Your Final Answer would be 10.90 cm

Hope this helps!

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3 years ago

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Suppose that a jewelry store tracked the amount of emeralds they sold each week to more accurately estimate how many emeralds to

Marysya12 [62]

Answer:

The mean is 2.75.

The margin of error is 0.62.

Step-by-step explanation:

In this case, we know the 95% confidence interval, and we want to know the mean and the margin of error.

The mean can be calculated as the average between the upper limit and lower limit:

$\mu=\frac{UL-LL}{2}=\frac{3.37+2.13}{2}=\frac{5.5}{2}=2.75$

The margin of error is the difference between the upper (or lower limit) and the mean. It equals the product between the z-value and the standard deviation divided by the square of the sample size.

It can also be calculated as half the difference of the limits of the confidence interval.

We only have the limits of the confidence interval to calculate the margin of error:

$ME=z\sigma/\sqrt{n}=\frac{UL-LL}{2}=\frac{3.37-2.13}{2}=\frac{1.24}{2}= 0.62$

5 0

3 years ago

Help help help help!!!!!

Art [367]

Area is equal to length times width, so we can use this over here:

Area = lw
Area = (x+7)(x+1)
Area = x^2+x+7x+7
Area = x^2+8x+7

Hope this helps!! :)

3 0

3 years ago

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Which fraction is equivalent to -6.19

Nikitich [7]

Answer:

= -6 19/100 (as a mixed fraction)

= -619/100 (as a improper fraction)

Step-by-step explanation:

-6.19

= -6 19/100 (as a mixed fraction)

= -619/100 (as a improper fraction)

4 0

3 years ago