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Natalka [10]
3 years ago
7

Can someone plz help me

Mathematics
1 answer:
boyakko [2]3 years ago
7 0

Answer:

A = 139.25 cm^2

Step-by-step explanation:

The composite shape is made up of a square with side 10 cm and a semicircle with diameter 10 cm. The area of the composite shape is the sum of the two areas. The diameter of the semicircle is the side of the square, and the radius of the circle is half of the diameter.

A = s^2 + (1/2)(pi)r^2

r = d/2 = s/2

A = (10 cm)^2 + (1/2)(3.14)(10 cm/2)^2

A = 100 cm^2 + (1/2)(3.14)(25 cm^2)

A = 139.25 cm^2

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What is the answer of<br> b2 - 81 ? <br>​
NemiM [27]

Answer:

2(b-40.5)

Step-by-step explanation:

2(b-81) therefore 2 is the HCF(Heighest common factor)

u have to divide both terms by 2

(2b÷2)-(81÷2)

2(b-40.5)

6 0
3 years ago
Help me out please<br> and i need a step by step explanation
AVprozaik [17]

Answer: 1 + (-1) + (-4) = -4

Step-by-step explanation:

By counting how many chips there are, you can get the following:

1 positive chip + 1 negative chip + 4 negative chips, which is

+1                      +          -1              + 4 x -1

= 1                     -1                           -4

= -4

4 0
3 years ago
X – 7 = -2. how do i do this​
Verdich [7]

Answer:

x= 5

Step-by-step explanation:

x – 7 = -2

Add 7 to each side

x – 7+7 = -2+7

x = 5

8 0
3 years ago
Read 2 more answers
Slope -1 passes through (7,2)
kvv77 [185]
Y = mx + b
slope(m) = -1
(7,2)...x = 7 and y = 2
now we sub and find b, the y int
2 = -1(7) + b
2 = -7 + b
2 + 7 = b
9 = b

so ur equation of this line is : y = -1x + 9.....can also be written as :
y = -x + 9....or if u need it in standard form, it is : x + y = 9
8 0
3 years ago
Read 2 more answers
Compute the mean and variance of the following probability distribution. (Round your answers to 2 decimal places.) x P(x) 6 0.10
irinina [24]

Answer:

Mean = 16.5

Variance = 35.55

Step-by-step explanation:

 <u>          x      P(x)        x. P(x)     x²            x². P(x)</u>

          6      0.10          0.6      36            3.6

         12     0.35          4.2       144           50.4

        18     0.25           4.5       324            81

<u>         24     0.30          7.2        576         172.8</u>

                  ∑x P (x)  16.5         ∑x² P (x) 307.8

The expected value of x E[X] gives the mean where X is the discrete random variable with the given probabilities.

Mean is given by  E(X)=  ∑x P (x) =  16.5

Similarly the variance is also calculated using the expected value of X and X².

Variance is given= E(X)²-  [E(X)]²= 307.8- (16.5)²=  307.8-272.25 = 35.55

6 0
3 years ago
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