Solve problem. See Example.Electricity Usage The graph shows the daily megawatts of electr...

Solve problem. See Example.

Electricity Usage The graph shows the daily megawatts of electricity used on a record-breaking summer day in Sacramento, California.

(a) Is this the graph of a function?

---

(b) What is the domain?

---

(c) Estimate the number of megawatts used at 8 A.M.

---

d) At what time was the most electricity used? the least electricity?

---

(e) Call this function f. What is ? What does it mean?

---

(f) During what time intervals is electricity usage increasing? decreasing?

Example

INTERPRETING A GRAPH

Figure 30