Is 15\16 already in its simplest form?

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?

Which graph of a hyperbola represents the equation 16x^2-y^2=16