Oi :)
1) There are 3 significant digits

2)
15 Mi/h = 22 ft/s
3)

4)
There are 4 significant digitis. Leter C
Answer:
4
Step-by-step explanation:
0*(1/3125)+1*(4/625)+2*(32/625)+3*(128/625)+4*(256/625)+5*(1024/3125)
Answer:
12
Step-by-step explanation:
144/16=9
Each child gets sixteen coins if there are nine children.
9+3=12
There are three more children so there are twelve.
I would guess it would be
7 and -7