Answer: 306 inches or 25.5 feet or 8.5 yards.
Explanation:
Given: Carol has 90 inches of ribbon, Tino has 7.5 feet of ribbon, and Baxter has 3.5 yards of ribbon.
1 feet = 12 inches
length of ribbon Tino has = 12 x 7.5 = 90 inches
1 yard = 36 inches
length of ribbon Baxter has = 3.5 x 36 = 126 inches
Total ribbon they have = (length of ribbon Carol has) + (length of ribbon Tino has) + (length of ribbon Baxter has)
= (90+90+126) inches
= 306 inches
In feet , Total ribbon =
![[\text{ 1 inch}=(1)/(12)\text{ feet}]](https://img.qammunity.org/2021/formulas/mathematics/college/9dkgur4eia1r4rwun2eg1bclnmeuwge69q.png)

In yards, Total ribbon =
![[\text{1 feet}=(1)/(3)\text{ yard}]](https://img.qammunity.org/2021/formulas/mathematics/college/5h2yo6ctr80zs8wtnq7kqiryqso16ic3kg.png)

Hence, the total length of ribbon the three friends have is 306 inches or 25.5 feet or 8.5 yards.