Answer: 2730
---------------------------------------------------------
Explanation:
A shortcut way is to start at 15 and count down til you reach three values. So that means you'll have 15, 14, 13 which multiplies out to...
15*14*13 = 2730
Or you can use the nPr formula, with n = 15 and r = 2, to get the same answer
nPr = (n!)/((n-r)!)
15P3 = (15!)/((15-3)!)
15P3 = (15!)/(12!)
15P3 = (15*14*13*12!)/(12!)
15P3 = 15*14*13
15P3 = 2730
$50 - $19 = $31
$31 - $5.50 = $25.50
$4.95 ÷ $25.50 = 5
5 x 100 = 500 notices
Answer:
950?
Step-by-step explanation:

Regardless of the sign of

, we have

(never negative). But multiplying by -1 makes it negative.
On the other hand,

which can never be negative for real

.
Yes you have the correct answers for each of the four problems. Nice work.
For anyone curious,
rd = removable discontinuity
id = infinite discontinuity
c = continuous