In Exercises 31–50, perform the indicated computations. Write the answers in scientific notation. If necessary, round the decimal factor in your scientific notation answer to two decimal places.(3X10⁴)(2.1X10³)

Multiply or divide as indicated. Write answers in lowest terms as needed. (1/8)∙(10/7)

Insert ∈ or ∉ in each blank to make the resulting statement true. 13 _____ {3, 5, 12, 14}

Find the union of the sets. {1,3,5,7}∪{2,4,6,8,10}

Find each sum or difference. 13 + (-4)

Insert ∈ or ∉ in each blank to make the resulting statement true. 0 _____ {0, 2, 3, 4}

Insert ∈ or ∉ in each blank to make the resulting statement true. 0 _____ {0, 5, 6, 7, 8, 10}

Multiply or divide as indicated. Write answers in lowest terms as needed. (21/8)∙(4/7)

Find each sum or difference. -7/3 + 3/4