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Evgesh-ka [11]
2 years ago
5

Answer pleaseeeeeeeeeee

Mathematics
2 answers:
MrRa [10]2 years ago
7 0

Answer:

I think you have the right answers looks like to me you do.

Step-by-step explanation:

Radda [10]2 years ago
7 0
The answer you put is right
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Can someone help me with these problems please! Im so confused
Schach [20]

Step-by-step explanation:

why are you confused ?

the question is to get the area of the shaded (= grey) areas.

all the shapes are clearly combined shapes out of several basic shapes, and in some cases we need to add then, and in some we need to subtract them from each other (to eliminate any white content).

that is really all that needs to be done.

of course, it is important to notice the different metrics used for the lengths, which define the metrics to be used for the areas.

a.

a rectangle and 2 half-circles on the sides (they are together one full circle).

radius is always 1/2 of the diameter of a circle.

and the width of the rectangle is exactly the diameter (= 2×radius) of the circle(s).

grey area :

rectangle : 20×(6×2) = 20×12 = 240 m²

circle : pi×r² = pi×6² = pi×36 = 113.0973355... m²

in total :

240 + 113.0973355... = 353.0973355... m²

b.

a trapezoid minus a circle.

the area of a trapezoid is

(a+b)×h/2

and h (height) is again the diameter of the circle (2×radius).

grey area :

trapezoid : (9 + 15)(4×2)/2 = 24 × 4 = 96 ft²

circle : pi×r² = pi×4² = pi×16 = 50.26548246... ft²

in total :

96 - 50.26548246... = 46.26548246... ft²

c.

3 rectangles.

rectangle1 - rectangle2 + rectangle3.

grey area :

rectangle1 : 14×10 = 140 m²

rectangle2 : 10×6 = 60 m²

rectangle3 : 6×2 = 12 m²

in total :

140 - 60 + 12 = 92 m²

d.

a circle minus a square.

the only specialty here is the diameter and radius of the circle : the diagonal of the inner square.

we get the diagonal of the inner square via Pythagoras, because the diagonal makes 2 right-angled triangles out of the square.

diagonal² = 4² + 4² = 16+16 = 32

diagonal = sqrt(32)

radius = diagonal/2 = sqrt(32)/2 = sqrt(32/4) = sqrt(8)

grey area :

square : 4×4 = 16 cm²

circle : pi×r² = pi×(sqrt(8))² = pi×8 = 25.13274123... cm²

in total :

25.13274123... - 16 = 9.132741229... cm²

is there still anything unclear ?

please let me know.

but as you can see there is no need to panic. just use basic math and common sense.

8 0
2 years ago
Assume a population of 46, 51, 53​, and 59. Assume that samples of size nequals=2 are randomly selected with replacement from th
Katarina [22]

Answer:

Step-by-step explanation:

There are four values 46, 51, 53, 59

we have to draw 2 sampler with replacement

sampler     median     samler     median

46.46              46          53.46         49.5

46.51               48.5        53.51          52

45..53              49.5        53.53         53

46.59               52.5        53.59         56

51.46                 48.5        59.46        52.5

51.51                   51           59.51           55

51.53                   52          59.53          56

51.59                   55          59.59          59

sampling distribution of the median

median                   probability

46                               1/16

48.5                             2/16      

49.5                             2/16  

52.5                             2/16    

51                                  1/16

52                                2/16

55                                 2/16

53                                  1/16

56                                  2/16

59                                   1/16    

6 0
3 years ago
When Deion was born, his grandfather gave him a 7.5-gram gold coin as a present. Today, Deion read in the newspaper that a gram
Sindrei [870]

Step-by-step explanation:

1 garm = $50.04

7.5 gram = 50.04 × 7.5 = $375.3

7 0
2 years ago
I will fan and medal if you help!
Annette [7]
Part A: The answer is B.
As vertically opposite angles are equal
x+10=4x-35
10=3x-35
45=3x
x=15

Part B: The answer is D.
We'll substitute in the value of X in one equation.
x+10
=15+10
=25
As the two angles are equal bot must be 25 degrees.
8 0
2 years ago
What is 2x+y=4 and 2x+y=-1
butalik [34]

Answer:

{x,y} = {5,6}

Step-by-step explanation:

// Solve equation [1] for the variable  x

 [1]    x = y - 1

// Plug this in for variable  x  in equation [2]

  [2]    2•(y -1) - y = 4

  [2]    y = 6

// Solve equation [2] for the variable  y

  [2]    y = 6

// By now we know this much :

   x = y-1

   y = 6

// Use the  y  value to solve for  x

   x = (6)-1 = 5

5 0
3 years ago
Read 2 more answers
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