Can i have help please? it would be really nice!

Mathematics

1 answer:

Julli [10]3 years ago

8 0

Hi!

The scale factor is 3.

You just have to divide 6/2 to get 3.

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A cube has a volume of 2197 m^3. Its surface is to be painted. Each can of paint covers about 40 m^2. How many cans of paint are

Gelneren [198K]

Volume= a³
a=edge
2197 = a³
=> a=13 m
Surface area=6a²=6*13²=6*169=1014 m²
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=> 26 cans needed

8 0

3 years ago

How do you rewrite 3.83 repeating as a simplified fraction

babymother [125]

If the number is 3.8333333.... then

X=3.83333....
10X = 38.3333.....

10X - X
38.3333....
- 3.8333....
= 34.5
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X = 34.5/9
Multiple both top and bottom by 2 to get rid of decimal.
69/18
Normalize it to get rid of improper fraction.
3 15/18
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If the number is 3.838383838383.... then
X = 3.83838383...
100X = 383.83838383...

100X - X = 99X
383.83838383...
3.83838383...
380

99X = 380
X = 380/99

X = 3 83/99

4 0

3 years ago

The ratio of the number of dolls Jacky had to the number of dolls Peter had was 5 : 2 but, after Jacky gave 15 dolls to Peter, t

tester [92]

Answer:

35 [$]

Step-by-step explanation:

1) if Peter's sum is p and Jacky's is j, then the ratio 5:2 in the condition can be written j/p=5/2;

2) the phrase 'after Jacky gave 15 dolls to Peter, they have an equal number of dolls' can be written as j-15=p;

3) using the two above it is possible to make up the system of two equations:

$\left \{ {{\frac{j}{p} =5/2} \atop {j-15=p}} \right. \ = > \ \left \{ {{j=2.5p} \atop {j-15=p}} \right. \ = > \ \left \{ {{j=25} \atop {p=10}} \right.$