B is the answer. Think of a clock, one hand at 12 and one hands at 3 is 90 degrees. That is a little less than 90 degrees so it's approximately 60 degrees.
I think it's the last one, i'm not sure though
To answer this question, you need to know the formula for calculating the perimeter of a rectangle and translating the description into the formula. The description formula should be:
width = x
length - 1 = 1/6 x
length= 1/6 x +1
Then adding them to perimeter formula you will get
perimeter= length * width
perimeter= 1/6x+ 1 * x= 1/6x^2 + x
