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VladimirAG [237]
4 years ago
15

What is the sum of (2a - 3b) and (5b - a)

Mathematics
1 answer:
GalinKa [24]4 years ago
8 0

Answer:

\boxed{a + 2b}

Step-by-step explanation:

=  > (2a  - 3b) + (5b - a) \\  \\  =  > 2a - 3b + 5b - a \\  \\  =  > 2a - a + 5b - 3b \\  \\  =  > a + 2b

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Step-by-step explanation:

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The brand manager for a brand toothpaste must plan a campaign designed to increase brand recognition. He wants to first determin
bulgar [2K]

We need to find out how many adults must the brand manager survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage.

From the given data we know that our confidence level is 90%. From Standard Normal Table we know that the critical level at 90% confidence level is 1.645. In other words, Z_{Critical}=1.645.

We also know that E=5% or E=0.05

Also, since, \hat{p} is not given, we will assume that \hat{p}=0.5. This is because, the formula that we use will have \hat{p}(1-\hat{p}) in the expression and that will be maximum only when \hat{p}=0.5. (For any other value of \hat{p}, we will get a value less than 0.25. For example if, \hat{p} is 0.4, then 1-\hat{p}=0.6 and thus, \hat{p}(1-\hat{p})=0.24.).

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3 years ago
The power g2 is equivalent to 81. What is the value of g-2?
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