1) round 168,356 to the nearest ten thousand.2) round 446,221 to the nearest ten3) round 45,122 to the nearest ten thousand.4) round 7,782 to the nearest hundred.

1) 170,000

2) 446,220

3) 50,000

4)  7,800

Step-by-step explanation:

When we round a number to the nearest hundred then we check the digit at tens place,

If the digit is less than 5 then the number is rounded to previous thousand and if it is 5 more than 5 it is rounded to the next thousand,

While, in the case of rounding nearest ten and ten thousand we check the digit at ones place and thousand place respectively.

1)168,356 to the nearest ten thousand is 170,000  ( ∵ thousand place digit = 8 > 5 )

2) 446,221 to the nearest ten is 446,220 ( ∵ ones place digit = 1 < 5 )

3) 45,122 to the nearest ten thousand is 50,000 ( ∵ thousand place digit = 5 ≥ 5 )

4) 7,782 to the nearest hundred is 7,800 ( ∵ tens place digit = 8 > 5 )

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.

hope this !