The radius of Matilda's bracelet is 2.784 inches
Step-by-step explanation:
Given,
The circumference of Matties bracelet is = 7 inches
The bracelet of Matilda is 2.5 times of Matties's bracelet
So, the circumference of Matilda's bracelet = 2.5 × 7 inches = 17.5 inches
To find the radius of Matilda's bracelet
Formula
The circumference of circle of radius(r) = 2πr inches
According to the problem,
2πr = 17.5
or, r = 
= 2.784 inches (approx)
The time it takes to cover 279 miles is 4.5 hours.
<h3>What is rate?</h3>
Rate is a measure of one quantity against another.
Analysis:
If it takes 6 hours to cover 279 miles, then it takes 6/372 hours to cover 1 mile.
Therefore 279 miles = 6/3472 x 279 = 4.5 hours
Learn more about rate: brainly.com/question/24304697
#SPJ1
You can use Google or a calculated but to check it but it's : 6