If it took 4 miles per hour you multiply that twice cuss its traveling back then forth so you repeat the same process 30 miles times 2 which is 60 hope this helps.
ANSWER

EXPLANATION
To find the number of balloons that are purple, we have to find six-sevenths of 35.
That is:

That is the number of balloons that are purple.
Answer:
43
Step-by-step explanation:
Y = 4x - 3
y = 1/3x + 4
y = -4/5x + 5
y = 3x + 10