Find each sum or difference. -2.8 + 4.5

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.(1.6X10¹⁵)(4X10⁻¹¹)

Write each number in decimal notation: 7.45*10^(-5)

In Exercises 29–34, find the union of the sets. {e,m,p,t,y} ∪ ∅

Write each number in scientific notation. 3,590,000

In Exercises 35–38, list all numbers from the given set that are a. natural numbers, b. whole numbers, c. integers, d. rational numbers, e. irrational numbers, f. real numbers. {-9, -4/5, 0, 0.25, √3, 9.2, √100}

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.(6.1X10⁻⁸)(2X10⁻⁴)

Insert ∈ or ∉ in each blank to make the resulting statement true. {0} _____ {0, 1, 2, 5}

Multiply or divide as indicated. Write answers in lowest terms as needed. 3(1/4)*1(2/3)