I need help with parts D & E, but if parts A-C are incorrect please also help with that.

Thanks

Historical demand for a product is: DEMAND January February March April May June 19 18 a. Using a weighted moving average with weights of 0.50 (June), 0.20 (May), and 0.30 (April), find the July forecast. (Round your answer to 1 decimal place.) July forecast 17.6 b. Using a simple three-month moving average, find the July forecast. (Round your answer to 1 decimal place.) July forecast 41.0 c. Using single exponential smoothing with a = 0.20 and a June forecast = 12, find the July forecast. (Round your answer to 1 decimal place.) July forecast 13.2 d. Using simple linear regression analysis, calculate the regression equation for the preceding demand data. (Do not round intermediate calculations. Round your intercept value to 1 decimal place and slope value to 2 decimal places.) Y= e. Using the regression equation in d, calculate the forecast for July. (Do not round intermediate calculations. Round your answer to 1 decimal place.) July forecast