Evaluate each expression 27^(-4/3)

Insert ⊆ or ⊈ in each blank to make the resulting statement true. ∅ ____ ∅

Add or subtract as indicated. Write answers in lowest terms as needed. 7/12 - 1/3

Find each product or quotient where possible. 100/-25

Express the distance between the given numbers using absolute value. Then find the distance by evaluating the absolute value expression. −2 and 5

Simplify using properties of exponents. $\left(5x^{\frac{2}{3}}\right)\left(4x^{\frac{1}{4}}\right)$

Determine whether each statement is true or false. {5, 7, 9, 19} ∩ {7, 9, 11, 15} = {7, 9}

Write each number in decimal notation without the use of exponents. $-8.17\times {10}^6$