Answer:
30?
Step-by-step explanation:
divide 20 by 8 and then times the answer by 12
Answer:
Step-by-step explanation:
Rules for adding: if the bases are the same you can add them, and subtracting happens in a fraction
A + b = 15 ..... eq 1
a – b = 12 ...... eq 2
So a = 15 – b
Substitute in eq 2 :
15 – b – b = 12
15 – 2b = 12
–2b = 12 – 15
b = 1.5
So a = 15 – 3/2 = 13.5
4ab = 4 x 13.5 x 1.5 = 81
