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VashaNatasha [74]
3 years ago
13

7.22 (10b-3) =7b-14

Mathematics
1 answer:
faust18 [17]3 years ago
3 0
Multiply 7.22 onto 10b and -3
new equation - 72.2b-21.66=7b-14

add 21.66 onto -14
new equation - 72.2b=7b+7.66

subtract 7b from 72.2
new equation: 65.2b=7.66

divide 65.2 from b
new equation: b=7.66/65.2

final answer: b=0.117
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Factorise fully <br> -x-5
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The fully factorized version of  -x-5 is -1 \times (x+5).

What is Factorization?

Usually, factorization or factoring means writing a number (or another mathematical object) as a product of minor or more uncomplicated objects of the same kind.

Given -x-5 is a linear expression.

For factorizing, first, make the coefficient of x positive. For this take -1 common.

⇒ -x-5 = -1\times(x+5)

Now take the greatest common divisor (gcd) of absolute values of coefficients in x+5.

⇒ gcd(1,5) = 1.

Now take gcd 1 common in the expression.

⇒ -1\times1\times(x+5)

⇒ -1\times(x+5).

∴ The fully factorized version of -x-5 is -1\times(x+5).

Learn more about factorization here:

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Assume standard deviation of all invoices is $200. Sample 100 invoices. What is the standard deviation of xbar
posledela

Answer:

<h3>20</h3>

Step-by-step explanation:

Standard deviation of the mean is expressed as:

SM = s/√n

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n is the sample size of the invoiced

Given

s = $200

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Required

Standard deviation of the mean

Substitute the given parameters into the given equation

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