
4

2² simplified means 2 times 2 (2 times itself) so
2² = 4
2×2=4
2²=4
Now , it doesn't make any difference with a number like 2 .
Suppose we had 3 :
3² = 9
3² is not the same as 3 ×2 , and here's the reason for that :
3²=3×3=9
3 × 2 = 6

So basically to estimate your answer, you must
Mayumi: 3 miles / 2 hours.
12 miles / 3 miles = 4
12 miles / 8 hours
Edwin: 4 miles / 3 hours.
12 miles / 4 miles = 3
12 miles / 9 hours.
Edwin takes more time to complete a 12-mile hiking trail. He takes 1 hour more than Mayumi.
Answer: Y=5x-3
Slope is 5/1
Y-int is (0,-3)