2 years ago

Percentage increase please use working out

Mathematics

1 answer:

S_A_V [24]2 years ago

7 0

Answer:

$15.22\%$

Step-by-step explanation:

The population in 1981 is 46 million.

In 2011, the population increased to 53 million.

The increase in population is (53 -46)million =7 million

Now we express 7 million as a percentage of 46 million

$=\frac{7}{46}*100\%$

$=0.1522*100\%$

=15.22%

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0.3643 in scientific notation

lord [1]

3.643 x 10^-1 would be the answer

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3 years ago

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Determine whether 81 − 49n4 is a difference of two squares. If so, factor it. If not, explain why.

Mumz [18]

We have

$81-49n^4=9^2-(7n^2)^2$

so this is indeed a difference of squares. Factorizing would give

$81-49n^4=(9-7n^2)(9+7n^2)$

making the answer D.

We can further factor the first term here and write

$9-7n^2=3^2-(\sqrt 7\,n)^2=(3-\sqrt7\,n)(3+\sqrt7\,n)$

but that's clearly out of the scope of this question.

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2 years ago

A calculus exam has a mean of µ = 73 and a standard deviation of σ = 4. Trina's score on the exam was 79, giving her a z-score o

kirza4 [7]

Answer:

I get z = +1.8

x= 79

m= 73;s= 4;z= (x-m)/s= 1.5

hope it helps you

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3 years ago

Write the ordered pair that represents YZ. Then find the magnitude of YZ. y(-4,12), Z(1,19).

ki77a [65]

The magnitude of YZ is 8.6

<u>Explanation:</u>

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Y( -4, 12)

Z ( 1, 19)

Magnitude of YZ = ?

We know:

$YZ = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

On substituting the value we get:

$YZ = \sqrt{(1+4)^2 + (19 - 12)^2} \\\\YZ = \sqrt{(5)^2 + (7)^2} \\\\YZ = \sqrt{25+49} \\\\YZ = \sqrt{74} \\\\YZ = 8.6$

Thus, the magnitude of YZ is 8.6

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3 years ago

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Solve for x please thanks

stealth61 [152]

Answer:

x = 9

Step-by-step explanation:

17x - 1 = 84 + 7x + 5

17x - 7x = 84 + 5 + 1

10x = 90

x = 9

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2 years ago