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olga55 [171]
3 years ago
5

Find the amount of change and the percent of decrease in the number of Hurricanes from 2008 to 2009 and from 2010 to 2011. Compa

re the amounts of change and the percents of decrease.
PLZ HELP

Mathematics
1 answer:
AlekseyPX3 years ago
5 0
Well, in the chart for 2008 it has 8 hurricanes, in 2009 it has based on that bar, 3 hurricanes, the change is then 5, 8 - 3  = 5.

now if we take 8 to be the 100%, what is 5 off of it in percentage?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
8&100\\ 5&p
\end{array}\implies \cfrac{8}{5}=\cfrac{100}{p}\implies p=\cfrac{5\cdot 100}{8}\implies p = 62.5

now in 2010, there were 12 hurricanes, whilst looking at the bar, in 2011 there were only 7, so that's a change of 5.

if we take 12 to be the 100%, what is 5 off of it in percentage?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
12&100\\
5&p
\end{array}\implies \cfrac{12}{5}=\cfrac{100}{p}\implies p=\cfrac{5\cdot 100}{12}\implies p\approx 41.67
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Two more than 16 times a number is the same as 21 less than the product of -7 and the number
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Answer:

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Step-by-step explanation:

<u>Let the number be x, and we have equation:</u>

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The number is -1

7 0
2 years ago
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2 years ago
Is 4(4a+20b) equivalent to 16a+24b
8090 [49]
No.

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7 0
3 years ago
PLEASE PLEASE HELP ​
nekit [7.7K]

Answer:68.3 degrees

Step-by-step explanation:

The diagram of the triangle ABC is shown in the attached photo. We would determine the length of side AB. It is equal to a. We would apply the cosine rule which is expressed as follows

c^2 = a^2 + b^2 - 2abCos C

Looking at the triangle,

b = 75 miles

a = 80 miles.

Angle ACB = 180 - 42 = 138 degrees. Therefore

c^2 = 80^2 + 75^2 - 2 × 80 × 75Cos 138

c^2 = 6400 + 5625 - 12000Cos 138

c^2 = 6400 + 5625 - 12000 × -0.7431

c^2 = 12025 + 8917.2

c = √20942.2 = 144.7

To determine A, we will apply sine rule

a/SinA = b/SinB = c/SinC. Therefore,

80/SinA = 144.7/Sin 138

80Sin 138 = 144.7 SinA

SinA = 53.528/144.7 = 0.3699

A = 21.7 degrees

Therefore, theta = 90 - 21.7

= 68.3 degees

8 0
3 years ago
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