By the pythagorean theorem:
L^2=9^2+x^2
and we are told if:
L^2=(x+3)^2
L=x+3
L-3=x now using this in our first equation L^2=9^2+x^2 we get
L^2=9^2+(L-3)^2
L^2=81+L^2-6L+9
0=90-6L
6L=90
L=15 ft
Answer:
15,240,960 serial numbers
Step-by-step explanation:
Since no repeats are allowed and the order matters, the number of possible serial numbers is given by the product of the permutation of 4 out of 9 letters by the permutation of 4 out of 10 numbers:

There are 15,240,960 ways to generate a serial number.
Answer:
6
Step-by-step explanation:
100 2 zeros...............