Explanation:
Question b has already been answered in part one. This is an exponential function.
C) 7 is the initial number of people who received the email;
7*2^n is the number of people who receive the email on day n;
2 is the factor of which the number of people increases each day.
D) On day 5,
![{2}^(5) * 7 = 32 * 7 =224](https://img.qammunity.org/2022/formulas/mathematics/high-school/ipa3em3p8y39fen25gjossmrkp6a1rhkax.png)
people will have received the email.
E) 2; 0 (no people has received the email on day 0). The equation is
![y = {2}^(x) * 7](https://img.qammunity.org/2022/formulas/mathematics/high-school/pd1tcx5qch9ljyk86j8yqtjf9ay0i846ly.png)
With x in the natural numbers