Answer:
9
Step-by-step explanation:
you can always use guess-and-check:
124 seems rather high
(6)P(2) = 6!/4! = 6x5 ≠ 72
(9)P(2) = 9!/7! = 9x8 = 72
C. A non-equilateral triangle does not have three congruent sides. True
Answer:

Step-by-step explanation:

Expand 


Now it is time to think.
Once




We can get something in the format

From the conclusions above,

Answer:
0.37
Step-by-step explanation:
5x^2-6x-7=0
25x-6x-7=0
19x-7=0
19x=7
0.37