Abigail, Alexander, and Christopher had a challenge to see who could bike the farthest in one day. Abigail biked 9 miles, Alexander biked 4 times as many miles as Christopher and Christopher biked 3 times as many
miles as Abigail. How many miles did Alexander bike?

If Abigail biked 9 miles and and Christopher biked 3 times as many as she did then he biked 27 miles. If Alexander biked 4 times as many miles then Christopher then Alexander biked 108 miles.

Step-by-step explanation:

9 x 3 = 27 x 4 = 108

x + 107

step-by-step explanation:

let's say that the number he had before the mistake was x. then, he will have 107 dollars more than this, so the answer is x + 107.

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1