I believe the answer would be 28
Answer: Base numbers are the number of units, or numbers, we use in our counting system, also called a number system. The most common base number is ten because the digits 0-9 are used in the number system. In other words, whenever we want to tell a number to someone we don't use any numbers besides 0-9. If it was a base-5 number system we would only use five different digits, like 0-4.
Step-by-step explanation:
<span>3 1/2 yards = 54 inches
</span><span>2 feet 10 inches =34 inches
</span><span>She had 2 feet 10 inches of ribbon left after trimming some curtains, that means
</span>54 inches - X =34 inches, 54 inches -34 inches<span> = X, X=20 inches
</span><span>The solution is 20 inches</span>