The monthly average high temperatures in degrees Fahrenheit at a beach can be modeled by P(x) = 0.0143x4 -0.425x3 +3.545x2-6.256x+64, where x = 1 corresponds to January and x = 12 represents December. (a) Find the average high temperature during March and August. (b) Estimate graphically and numerically the months when the average high temperature is about 70F. (a) Using the model P(x), the average high temperature in March is F, and the average high temperature in August is F. (Type an integer or decimal rounded to the nearest tenth as needed.)