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vovangra [49]
3 years ago
5

Good at area pls helppp Find the area. The figure is not drawn to scale.

Mathematics
1 answer:
Sauron [17]3 years ago
8 0

Answer:

A=13.8

Step-by-step explanation:

The area equals 13.8

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Can someone help pls omg
hodyreva [135]

Answer:

see explanation

Step-by-step explanation:

Sum the sides of both polygons and equate.

(20)

x + 4 + x + 2 + x + 5 = 2(x + 1) + 2(x + 3) ← distribute parenthesis

3x + 11 = 2x + 2 + 2x + 6

3x + 11 = 4x + 8 ( subtract 3x from both sides )

11 = x + 8 ( subtract 8 from both sides )

3 = x

(21)

5(12x) = x + 7 + 6x + 9 + x + 10

60x = 8x + 26 ( subtract 8x from both sides )

52x = 26 ( divide both sides by 52 )

x = \frac{26}{52} = \frac{1}{2}

4 0
2 years ago
In the figure below, angle y and angle x form vertical angles. Angle y forms a straight line with the 80° angle and the 60° angl
Yuri [45]

Answer:Then ask a neighbor for help

Step-by-step explanation:Hey just breath

4 0
2 years ago
Graph B
lara [203]

Answer/Step-by-step explanation:

Slope (m) = rise/run

y-intercept (b) = starting value or the point on the y-axis where the line cuts across

✔️Slope (m) of skater 1:

Rise = 45

Run = 7.5

Slope (m) = 45/7.5 = 6

✔️ y-intercept (b) of Skater 1:

b = 0 (the y-axis is intercepted at 0)

✔️Skater 1 linear function in slope-intercept form, y = mx + b

Substitute m = 6 and b = 0 into y = mx + b

Linear function: y = 6x + 0

y = 6x

✔️Slope (m) of skater 2:

Rise = 30

Run = 15

Slope (m) = 30/15 = 2

✔️ y-intercept (b) of Skater 2:

b = 0 (the y-axis is intercepted at 0)

✔️Skater 2 linear function in slope-intercept form, y = mx + b

Substitute m = 2 and b = 0 into y = mx + b

Linear function: y = 2x + 0

y = 2x

7 0
2 years ago
Consider this equation. 7.8+2(0.75m+0.4)=-6.4m+4(0.5m-0.8) Mia solved the equation and determined that m=2. Is she correct?
IgorC [24]

Answer:

B) She is incorrect because when substituting 2 for m the result was a false statement.

Step-by-step explanation:

Let's solve it for ourselves and see if Mia is correct:

7.8+2(0.75m+0.4)=-6.4m+4(0.5m-0.8)

7.8+1.5m+0.8=-6.4m+2m-3.2

1.5m+8.6=-4.4m-3.2

8.6=-5.9m-3.2

11.8=-5.9m

-2=m

m=-2

Since the answer is actually m=-2, Mia's guess is incorrect because plugging in m=2 does not make both sides equal. Therefore B is the correct option.

8 0
2 years ago
A data set includes 40 pulse rates of men, and those pulse rates have a mean of 67.3 beats per minute and a standard deviation o
Dafna11 [192]

Answer:

The 99% confidence interval of the  standard deviation of the pulse rates of men is  

       [ 7.949 \  \ , \  14.387 ]

Step-by-step explanation:

From the question we are told that

  The  sample size is  n  =  40

  The mean is  \= x  = 67.3 \  beats \  per \  minute

  The standard deviation is  s =  10.3 \ beats \ per \  minute

Generally the degree of freedom is mathematically represented as

     df =  n- 1

=>  df =  40- 1

=>  df =  39

From the question we are told the confidence level is  99% , hence the level of significance is    

      \alpha = (100 - 99 ) \%

=>   \alpha = 0.01

Generally from the chi distribution table the critical value  of   at a degree of freedom of is  

   X^2 _{\frac{\alpha }{2} , 39} =  65.476

Generally from the chi distribution table the critical value  of   at a degree of freedom of is  

   X^2 _{1- \frac{\alpha }{2} , 39} =  19.996

Generally the 99% confidence interval of the standard deviation of the pulse rates of men is mathematically represented as

  s \sqrt{\frac{n- 1}{X^2_{1- \frac{\alpha }{2} , n-1} } }\  \ , \ s \sqrt{\frac{n- 1}{X^2_{\frac{\alpha }{2} , n-1} } }

=>  10.3 \sqrt{\frac{40- 1}{65.476} }\  \ , \ 10.3 \sqrt{\frac{40- 1}{19.996} }

=>  [ 7.949 \  \ , \  14.387 ]

   

6 0
2 years ago
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