#### Answer

a. $-26$
b.$8$
c.$-10$
d.$5$

#### Work Step by Step

For two terms with the same sign, add their absolute values. Use the sign that both terms have as the answers.
a. $-20-6=-26$
Subtracting a negative number from a positive number leads to the two terms being added.
b.$3-(-5)=8$
c.$7-17=-10$
d.$-4-(-9)=5$