How many four-digit numbers can you form from the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9
(a) if you use each digit only once? \

i know the answer is 3,024 im just wondering how

3,024

Step-by-step explanation:

There are digits 1, 2, 3, 4, 5, 6, 7, 8, and 9 (9 digits in total).

The first digit of 4-digit number can be selected in 9 different ways (any of given digits can be chosen), then 8 digits remain.

The second digit can be selected in 8 different ways, then 7 digits remain.

The third digit can be selected in 7 different ways, then 6 digits remain.

The fourth digit can be selected in 6 different ways.

In total, there are

different ways.

rx and sx

step-by-step explanation:

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2