In Exercises 1–8, add or subtract as indicated and write the result in standard form. (7 + 2i) + (1 - 4i)

In Exercises 1–8, add or subtract as indicated and write the result in standard form. (3 + 2i) - (5 - 7i)

In Exercises 1–8, add or subtract as indicated and write the result in standard form. 6 - (- 5 + 4i) - (- 13 - i)

In Exercises 1–8, add or subtract as indicated and write the result in standard form. 8i - (14 - 9i)

In Exercises 9–20, find each product and write the result in standard form. (- 5 + 4i)(3 + i)

Identify each number as real, complex, pure imaginary, or nonreal complex. (More than one of these descriptions will apply.) -6 -2i

In Exercises 21–28, divide and express the result in standard form. 2/(3 - i)

Write each number as the product of a real number and i. -√-18