Answer
Add: $20a$
Subtract: $-10a$
Multiply: $75a^2$
Divide: $\frac{1}{3}$
Work Step by Step
Add: $5a+15a=20a$
Subtract: $5a-15a=-10a$
Multiply: $(5a)(15a)=75a^2$
Divide: $\frac{5a}{15a}=\frac{1}{3}$
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