A) 169p⁴qr÷ (-13pq³r)
b) 3(x +2y) +5x - (y + 7)
c (3x –4)( 5x- 1)

A)  -13p^33q^-2   or -13p^3/q^2

B)  8x + 5y - 7

C)  15x^2 -23x + 4

Step-by-step explanation:

A) 169/(-13) = -13     p^4/p = p^3    q/q^3  = 1/q^2  which can be written as q^-2 and r/r is 1. So if you put this all together you get  -13p^33q^-2   or -13p^3/q^2

B)  3(x +2y) + 5x - (y + 7)

     3x + 6y + 5x - y - 7   distributive property

     3x + 5x + 6y - y  -7   combine like terms

      8x + 5y - 7              Answer

C)  (3x-4) (5x - 1)    Foil multiply the first terms in each parenthesis. the outer terms, the inner terms and the last terms

(3x)(5x) + (3x)(-1) + (-4)(5x)  + (-4)(-1)

15x^2  -3x - 20x + 4  

15x^2 -23x + 4

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

25% is the answer