Lincoln invests money in an account paying simple interest. He invests $50 and no money is added or removed from the investment. After one year, he has $51.50. What is the simple percent interest per year?

the 3rd on is correct

step-by-step explanation:

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6

central angle of a triangle has the same measure as its intercepted arc.

step-by-step explanation:

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this