Can u answer #19. i really need . and show ur

P = m + n / -5 
-5p = m + n ( because -5 was dividing with m + n so on an other side it will multiply )
-5p - m = n

Ok so first you would want to multiply both sides by -5.
P(-5)=(m+n/-5)-5 (So now do the multiplication)
-5p= m+n (You got rid of the -5 because -5 multiplied by -5 is 1 and if you put one under m+n, it would still not change) Now, isolate the n.
-5p-m=n    < That would be your answer :)
I really hope this helped :)

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.