Need help on Problems 3 and 4.

3. Assume the United States' national debt can be estimated with the model y=2.07596(1.083415). a. According to the model, when did the debt pass $1 trillion ( $1,000 billion)? b. According to the model, what is the annual growth rate of the national debr? c. What is the doubling time for this growth model? 4. The table lists the consecutive notes from middle C to the next C note. this scale is called a chromatic scale and it increases in 12 steps, called half-tones. The frequencies measured in cycles per second, or hertz (Hz), chromatic scale form a geometric sequence. The frequency of the last C note in the table is double the frequency of the first C note. a. Write a function that will generate the frequencies. b. Fill in the missing table values