Find the intersection of the sets. {a,b,c,d}∩∅

Multiply or divide as indicated. Write answers in lowest terms as needed. (5/9)∙(2/7)

Evaluate each exponential expression: (3³)/(3⁶)

Insert ∈ or ∉ in each blank to make the resulting statement true. 6 _____ {3, 4, 5, 6}

Find each sum or difference. -6 + (-13)

Multiply or divide as indicated. Write answers in lowest terms as needed. (3/20)∙(5/21)

Simplify each exponential expression: $(-2x^4{y}^3{)}^3$

Insert ∈ or ∉ in each blank to make the resulting statement true. 5 ____ {4, 6, 8, 10}