4 is what is knows as the factorial of 4.
4=4*3*2*1=24
Answer:
B. 27.5
Step-by-step explanation:
1/2 (b x h)
B (Base) = 11
H (Height) = 5
1/2 (11 x 5)= 27.5
Hi!
1.)
a:A u B=

(The same elements are written once.)
b:A u C

c:B u C

Note:I used dots to mean commas .
Good work!
This is simple. It is 7 factorial, or 7!. This just means 7*6*5*4*3*2*1, which is 5040.