What is this math equation called, and how do you solve it? 100¡

you meant 100!, is a factorial, and yes, your calculator has [ ! ] button for factorials

5! is just 5*4*3*2*1

11! is just 11*10*9*8*7*6*5*4*3*2*1

and so on.

the answer is 510

step-by-step explanation:

15 • 13 = 195

15 • 12 = 180

15 • 5 = 75

12 • 5 = 60

195 + 180 = 375

375 + 75 = 450

450 + 60 = 510