Question

What is the value of the expression 1 – r – a when r = 20 and a = 6?
a. –27
b. –25
c. –15
d. –13

Answer 1

b. -25, because 1 minus 20 is -19, then you subtract 6 from -19, then the answer is -25.

Answer 2

1 - r - a      r=20    a =6
1 - 20 - 6 
  -19 - 6 =  -19 + (-6) 
     -25 would be the answer