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4 years ago

Please Please Help Me On This Question Mathematicians!!!!

Mathematics

1 answer:

Ivahew [28]4 years ago

8 0

Answer:

Step-by-step explanation:

The perimeter of the given triangle:

$(-x^2+3x+30)+(x^2-9)+(18-2x)=44$

$-x^2+3x+30+x^2-9+18-2x=44$ <em>combine like terms</em>

$(-x^2+x^2)+(3x-2x)+(30-9+18)=44$

$x+39=44$ <em>subtract 39 from both sides</em>

$x=5$

The length of the shortes side:

$18-2x=18-2(5)=18-10=8\ m$

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In an effort to determine whether any correlation exists between the price of stocks of airlines, an analyst sampled six days of

vovikov84 [41]

Answer:

Check the explanation

Step-by-step explanation:

Following table shows the calculations:

Delta, X Southwest , Y X^2 Y^2 XY

45.96 38.76 2112.3216 1502.3376 1781.4096

46.8 45.41 2190.24 2062.0681 2125.188

47.93 15.7 2297.2849 246.49 752.501

51.78 49.58 2681.1684 2458.1764 2567.2524

52.17 44.34 2721.7089 1966.0356 2313.2178

47.36 18 2242.9696 324 852.48

Total 292 211.79 14245.6934 8559.1077 10392.0488

Sample size: n =6

Now

$S_{yy}=\sum y^{2}-\frac{\left (\sum y \right )^{2}}{n}=1083.27$

$S_{xx}=\sum x^{2}-\frac{\left (\sum x \right )^{2}}{n}=35.03$

$S_{xy}=\sum xy-\frac{\left (\sum x \right )\left (\sum y \right )}{n}=84.94$

The coefficient of correlation is :

$r=\frac{S_{xy}}{\sqrt{S_{xx}S_{yy}}}=0.436$

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3 years ago

1. y=900(1.27)^x

Sophie [7]

Answer:

The initial value is 900

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Step-by-step explanation:

Exponential functions are in the form $y=a(b)^x$ , where a is the initial value, b is the multiplier, and x is the input, such as how many years past a certain date.

Exponential growth is when the multiplier is above 1.00, or above 100%, because b is determined by 1 + r if you have exponential growth, or 1 - r if you have exponential decay. You will never use negatives with exponential decay.

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2 years ago

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sergeinik [125]

Answer:

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Step-by-step explanation:

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3 years ago

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alukav5142 [94]

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2 years ago

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soldier1979 [14.2K]

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3 years ago