1/2 mile every 1/8 hour
Multiply by 8.
8/2 miles in 8/8 hours
4 miles per hour.
Triangle area = 1/2 times base times height
Triangle area = 1/2 x 5 1/2 x 3/14 (does not look like correct number)
Triangle area = 0.5 x 5.5 x 0.21
Triangle area = 0.5775
Did you mean:
Triangle area = 1/2 x 5 1/2 x 3 1/4 ???
Then
Triangle are = 0.5 x 5.5 x 3.25
Triangle area = 8.9375
You might need to keep it in fractions.
You have 10 numbers to choose from, and you're choosing 4 from that pool. Order of the numbers matters, because having 1234 as a PIN is not the same having it be 1324, so we're counting the number of permutations of 10 digits taken 4 at a time. So there are

possible PINs that can be made.
CA must be in the range [15 - 9, 15 + 9] = [6, 24]
For the line segments to form a triangle the length of CA cannot be less the the difference between the other sides or greater than their sum.
At either extreme the three points A, B and C will be co-linear thus forming a triangle with area of zero
Answer: 35%
Step-by-step explanation:
20 bars
7 unshaded - not installed
7/20 = 0.35 = 35%