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Keith_Richards [23]
3 years ago
9

5a - {3b - 5[a - (b + -4a)]}

Mathematics
1 answer:
bulgar [2K]3 years ago
5 0
Interesting problem. When computers first came out (when dinosaurs ruled the planet), we had to deal with problems that were many brackets deep.  So  this has practical applications.

Start at the very right and keep on removing brackets and collecting like terms.

5a - {3b - 5[a - (b - 4a)]} I just changed the sign on the right bracket.
5a - {3b - 5[a - b + 4a]}
5a - {3b - 5[5a - b]} Now deal with []. You are still on the right.
5a - {3b - 25a + 5b}
5a - {8b - 25a} Finally remove {}
5a - 8b + 25a
30a - 8b
If you can solve another like this, you are well on your way to being good in computer science.

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/viewform?hr submission=Chclk4feKBIQ.
Gennadij [26K]

Answer:

c) .22

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

In this question:

\sigma = 2.5, n = 500

Then

M = z*\frac{\sigma}{\sqrt{n}}

M = 1.96*\frac{2.5}{\sqrt{500}}

M = 0.22

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3 years ago
Identify the scale factor
nydimaria [60]

Answer:

Step-by-step explanation:

k = 4/24 = 1/6

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The answer is   C.99 < x < 315
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Convert from scientific notation to standard form 4.83 x 10^-3
ANTONII [103]

4.83 x 10^-3 can be re-written in standard form by moving the decimal point 3 units to the left:   0.00483.

Note:  If you want to be mathematically correct, please write 10^(-3), not 10^-3.  If the exponent is +, you don't need the parentheses.


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3 years ago
Which of the following could be the lengths of the sides of a 45°-45°-90° triangle?
REY [17]
I think the answer is c
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