90-20 leaves 70 for surfing. since surfing is 5 per hour, 70/5=14 hours she can surf.
Step-by-step explanation below
Answer:
The answer is 5
Step-by-step explanation:
First you subtract 3 from both sides and get 10. Then you divide by 2 and you get 5.
Answer:
Step-by-step explanation:
6(3x – 8) = 7(7x + 7)
18x - 48 = 49x + 49
49x - 18x = - 48 - 49
31x = - 97
x = - 97/31
