add x to both sides and add 17 to both sides you get 6x=24 so x=4

A: one digits numbers have 9 total 2 digit numbers have 180 total 3 digit have 2700 so there are 2889 digits

B: one 7 in one digits 19 7s in 2 digits and with 3 digits there are 281 digits so there are 301 digits

5000 is 2.5 times 2000 so 35 x 2.5 = 87.5 minutes

Using stars and bars its 17C7 because you need to find how many ways to arrange 10 stickers and 7 dividers. 17C7 is equal to 19448 ways

one member takes 30 minutes to paint 1600/20 80 square feet so one does 8/3 sq feet in one minute so 15 members is 8/3 x 15 per minute=40 ft per minute 1800/40= 45 minutes