There are 4 prime numbers from 1 to 10: 2, 3, 5, and 7. This means that there are 4 ways to choose the first outcome. There are 5 composite numbers from 1 to 10: 4, 6, 8, 9, and 10 (1 is just 1). So, you just multiply the two numbers together because each depends on each: 4 * 5 = 20 outcomes.
She can run 8 miles because every mile it takes 8 minutes to do so all you had to do was divide 64 and 8
B. Is the correct answer. A circle can not form a perpendicular bisector as it is rounded and not straight.
