I hope it isn't too late! Here is what I have.
1B
2D
3A
The answer is a rectangular prism.<span />
12/72 is equivalent to 1/6
1/6 of the population are building a nest
1/6 of 10,800 is 10,800/6 which is 1,800
about 1,800 are building a nest
Answer:
5x+3
Step-by-step explanation:
Rewrite the expression to 20x^2-3x-9/4x-3
Factor 20x^2+12x-15x-9/4x-3
Factor 4x*5x+3-3(5x+3)/4x-3
Factor (5x+3)*(4x-3)/4x-3
Solution then becomes 5x+3 as stated above
The amount of passwords possible is:

Since he only tries once for the first try we get:

Thus there is a:

Chance he will guess the password on his first try.