Answer:
-15
Step-by-step explanation:
6x-5-21x-70=0
-15x=0+5+70
-15x=75
x=75/-15
Ramona has a total of 119 sand dollars and will disperse them equally to x friends. Take the total (119) and divide it by x friends: 119/x = amount.
Going down stream the boats going 21 mph and upstream it's 3 miles per hour so the current im guessing is 7 mph