The ratio of the side lengths of a triangle is 3:4:6, and its perimeter is 65cm

A = 15cm, B = 20cm, C = 30cm

15cm : 20cm : 30cm

Step-by-step explanation:

Ratio of the 3 sides is 3:4:6 representing side A,B,C respectively.

Total ratio = 3 + 4 + 6 = 13

Since sum (perimeter) of all side is 65cm

Side A = 3/13 x 65 = 15cm

Side B = 4/13 x 65 = 20cm

Side C = 6/13 x 65 = 30cm

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

radha is now 5 years old

3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

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answer:

at time x=0 we have 1000, at time x=1 we have 2000, at time x=2 we have 4000.  

so that's an initial value of 1000 and a ratio of 2,

y = 1000 (2^x)

hope this !