Based on the data shown below, a statistician calculates a linear model y = - 2.8x + 48.85 37.44 34.72 32.8 29.48 24.86 24.34 O 21.42 17.6 Use the model to estimate the y-value when x = 4. Round the solution to two decimal places, if necessary. Use the model to estimate the y-value when a = 7. Round the solution to two decimal places, if necessary