! is factorial
it means multipliy all numbers from 1 to that number together
example
1!=1
2!=2*1
3!=3*2*1
etc
some things to note
7!*8=8!
4!*5*6=6!

so we can rewrite it as

=

=
Answer:
B. -1
Step-by-step explanation:
I calculated it logically
The answer should be C. By combining like terms you can find the answer. 1.75a+2.75a = 4.5a
2.25b + 1.75b = 4b
2.25c + 1.25c = 3.5c
Y=mx+b, b=y-intercept (value of y when x=0) so if:
y=30x+18
He earns 18 cents if he does not make any deliveries.