Answer:
b. 70
Step-by-step explanation:
The Binomial Coefficient can be used to calculate the number of ways objects can be arranged.
<u>Binomial Coefficient</u>

The exclamation mark "!" placed after a number means factorial and indicates to multiply all whole numbers from the given number down to 1.
Example: 4! = 4 × 3 × 2 × 1
The Binomial Coefficient gives us the number of ways of picking "r" unordered outcomes from "n" possibilities.
As there are 8 friends ⇒ n = 8.
As each car takes 4 friends ⇒ r = 4.
Substitute these values into the formula:

Learn more about the binomial coefficient here:
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brainly.com/question/27800539
Answer: 20 cm
Step-by-step explanation:
The length is 20-10=10 cm longer than the width. That is: 10 cm * 10 mm/cm = 100 mm
Answer:
5760
Step-by-step explanation:
I do 12 x 12 x 10 x 4= 5760