If the five digit number aa448 is divisible by 9, what digit does a represent?

a=1

Step-by-step explanation:

If the number is divisible by 9 the sum of its digits is divisible by 9 as well.

The numbers 18 , 27, 36 are divisible by 9 . Check each of them.

a+a+4+4+8=2a+16=18

2a=2

a=1

2a+16=27

2a=11

a=5.5 -it is not the digit . So is not the solution.

2a+16=36

2a=20

a=10 is not a digit, so isn't a solution

any bigger number divisible by 9 (45,54,63...) wil not give the digit.

So there is only 1 solution a=1

answer: -8.2562234e+13

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles