If you flip a coin twice, what is the probability that you will get heads both times?

a) 1/13
b) 1/2
c) 1/4
d) 1/6

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm