Can someone help?
Need to find x, and measure of angle DEF

Wrote and expression for the difference of p and 4

How is this equation completed? i cannot find any examples in the book.

If you invest 1,500 today in a bank that gives you a 5 percent annual interest rate, which of these items can you buy in two years? a. electronics worth $1,650 b. fitness equipment worth $1,700 c. a holiday package worth $2,000