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mrs_skeptik [129]
3 years ago
15

John has 30 marbles , 18 of which are red and 12 of which are blue. Jane has 20 marbles, all of them either red or blue. If the

ratio of the red marbles to the blue marbles is the same for both John and Jane, then John has how many more blue marbles than Jane?
Mathematics
1 answer:
morpeh [17]3 years ago
4 0
12/30 = percentage of blue marbles = 40%
40% of 20 =8
12-8 =4
John has 4 more blue marbles
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A hollow sphere sits snugly in a foam cube so that the sphere touches each side of the cube. Find the volume of the foam.
ExtremeBDS [4]

Answer:

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V-foam = 4r³( 2 - ----- )

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Step-by-step explanation:

Let the radius of the sphere be r.  Then the volume of the sphere is

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Next, recognize that the side length of the cube is 2r, and that the volume of the cube is thus

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Then the volume of the foam is equal to the volume of the cube less the volume of the sphere:

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5 0
3 years ago
Find the area of the figure. Use 3.14 for pie . Round your answer to the nearest tenth.
gizmo_the_mogwai [7]

Answer:

538.3

Step-by-step explanation:

First of all find the area of the rectangle

L*W

15*30

450

Now find the area of semi circle

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Since radius is half a diameter divided 15 by 2=7.5

1/2\pi 7.5^{2}                            7.5 times 7.5= 56.25

1/2*3.14*56.25

56 times 3.14 is 176.625 now multiply 176.625 by 1/2

Answer is 88.3125

Now add 450 to 88.3125

Final answer: 538.3125

7 0
3 years ago
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