Find a quadratic function that models the number of cases of flu each year, where y is years since 2012. What is the coefficient of x? Round your answer to the nearest hundredth.

Which best explains why this triangle is or is not a right triangle?

Which graph represents the parent function of y=(x+2)(x-2)

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.