Chapter 40, Problem 15A

Note: For Exercises 13 through 62 that follow, round the answers to 3 decimal places wherever necessary.
In Exercises 13 through 16, add the following signed numbers as indicated.
15. a. $-9\frac{1}{4}+\left(-3\frac{3}{4}\right)$

b. $18\frac{5}{8}+\left(-21\frac{3}{4}\right)$

c. $-13+\left(-\frac{5}{16}\right)$

d. $-4.25+\left(-7\right)+\left(-3.22\right)$

e. $18.07+\left(-17.64\right)$