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gayaneshka [121]
3 years ago
9

How do I work this out

Mathematics
1 answer:
Iteru [2.4K]3 years ago
5 0
If the track is 10km long, and X travels at 40 km/h, it will take 1 hour to do 4 laps. this means that car X will do one lap in 15 minutes. Y travels at 30 km/h, which means it will do 3 laps in 1 hour, meaning that car X will do 1 lap in 20 minutes.

X- 15, 30, 45, 60
Y-20, 40, 60


Therefore, after an hour, they will pass again.
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Cark earned grades of 62, 78, 59, and 89 on four tests.<br><br><br>what is the mean of his grades​
serious [3.7K]

Answer:

72

Step-by-step explanation:

mean=average. to get average, you add up the numbers and divide by how many numbers. they add upp to 288 and since theres 4 test grades, divide by 4 to get 72.

4 0
2 years ago
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Of the balloons recently sold by a party store, 2 were blue and 10 were other colors. Considering this data, how many of the nex
Bumek [7]

Answer: 3

Step-by-step explanation: i don't know how it explain it

8 0
3 years ago
the volume of the a sphere whoes diameter is 18 cm is cubic cm . if it's diameter were reduced by half, it's volume would be of
FrozenT [24]

Answer:

The new volume is 8 times smaller than the original volume

Step-by-step explanation:

we know that

If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube

Let

z-----> the scale factor

x ----> the volume of the reduced sphere

y ----> the volume of the original sphere

so

z^{3}=\frac{x}{y}

we have

z=1/2 ----> scale factor

substitute

(1/2)^{3}=\frac{x}{y}

(1/8)=\frac{x}{y}

x=\frac{y}{8}

therefore

The new volume is 8 times smaller than the original volume

Verify

The volume of the original sphere is

r=18/2=9\ cm ---> the radius is half the diameter

V=\frac{4}{3}\pi (9)^{3}=972\pi \ cm^{3}

the volume of the reduced sphere is

r=9/2=4.5\ cm ---> the radius is half the diameter

V=\frac{4}{3}\pi (4.5)^{3}=121.5\pi \ cm^{3}

Divide the volumes

972\pi \ cm^{3}/121.5\pi \ cm^{3}=8

4 0
3 years ago
Solve for me. 6= (y+2)
Rama09 [41]

Answer:

y=4

Step-by-step explanation:

if y+2=6, you can subtract 2 from both sides, giving you y=6-2. 6-2=4, which is y.

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Thirty adults were asked how many pets they have had over their lifetime. The results are shown in the histogram below. Which of
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The most likely answer would be C.
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