Iam greater than 15 i am less than 21 i have 8 ones

18

Step-by-step explanation:

bc 8 digits in the ones place, and less than 21 greater than 15

18 is greater than 15

18 is less then 21

18 has 8 ones

So the number is 18.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.