Rule of 72 is (72/interest%), so we do
(72/2.1%)=34.3
the answer is B
Answer:
-5/2
Step-by-step explanation:
In order to find the slope of a perpendicular line: negate the reciprocal of the original slope
I would say B, one because on A it is not NEARLY it IS, and second it is true, lol.
2x^2+x=1
2x^2+x-1=0
2x^2+2x-x-1=0
2x(x+1)-1(x+1)=0
(2x-1)(x+1)=0
x=-1 and 1/2