4205 is the answer I think
It’s the first one because the parabola is open
Answer:
40,320.
Step-by-step explanation:
We are asked to find the number of ways in which 8 books could be arranged on a shelf.
The 1st could be arranged in 8 ways. Since one place is filled, so 2nd book could be arranged in 7 ways.
Similarly, the 3rd book could be arranged in 6 ways as first two places are already taken. This process will go on.
So the 8 books can be arranged in 

Therefore, 8 books could be arranged in 40,320 ways.
Answer:
FALSE.
An isosceles triangle may be right or acute or obtuse,the angles measure (90°,45°,45°) or (60°,60°,60°) or (120°,30°,30°) respectively.
So the area of a triangle formula is a=hb times b /2 so 14 times 20 is 180 divide by 2 is 140