What are you confused on?
\(\text{Average Speed}=\frac{\text{Total Distance}}{\text{Total Time}}\)
5 + 3 = 8 miles = total distance
Total time = 1.1
8/1.1 = your answer
Hey guest
We copy AB to the other side of the circle. We can now form a rectangle. We use pythaogorean theorem to calculate the red line, which is the diameter.
\(4^2+7^2=65\)
DIameter = \(\boxed{\sqrt{65}}\)
You can't prove CAD is a right triangle because CD is not the diameter.
I recommend you work from 99 and go down in decreasing order. Guessing and checking won't take long.
EDIT: I got the answer 90 if zero counts as a digit.
That's a unique way to solve it!
I wish CPhill can nominate your answer as a "best" answer.
Use quadratic equation. Specifically, the determinant.
\(b^2-4ac\)
25 - 4c = c
25 = 5c
c = 5
I think there is only one.
Nice job! I can confirm because I got the same answer!
