The function that models the population [in thousands} of U.S. boys age 5 and under t years after 2010 is Bit) = -3.1?t2 + 119t + 10253 and a function that models the population (in thousands} of U.S. girls age 5 and under t years after 2010 is Glt} = -3.02t2 + 114t + 9802. 1) Find the equation that models the total estimated population (in thousands} of all U.S. children age 5 and under t years after 2010. 2) Use the equations given and the equation you found in part 2 to predict the number of boys, the number of girls and then the total number of children in the U.S. that are age 5 and under in a year of your choice {after 2010 but before 2021). 3) Go to the following website and determine the actual number of children in the U.S. that are age 5 and under in a year of your choice in part 2. 4) What does your answer in part 3 tell you about the validity of the model you found in