Answer:
Step-by-step explanation:
if the question is
-7p * -4r * 39
then it's
-1*-1*7*4*39*p*r
now you just need a calculator to find the numbers that are multiplied together
-1 * -1 = 1
7*4=28
28*39*p*r
1092*p*r
1092pr
