Answer:
12.87
Step-by-step explanation:
13.37 x3 = 40.11
13.51x2= 27.02
40.11+ 27.02= 67.13
80.00-67.13= 12.87
Answer: add 1 to both sides
-1+r+1≥4+1
simplify
x≥5
D = - 9
D - 7 = -18
D - 7 + 7 = -18 + 7
D = -9