91Ó°ÊÓ

Simplify each of the following as completely as possible. $$t^{5} t^{2} t^{8}$$

Convert each number into scientific notation. $$0.0001234$$

Multiply out each of the following. As you work out the problems, identify those exercises that are either a perfect square or the difference of two squares. $$(x+5)(x+4)$$

Simplify each of the following expressions as completely as possible. Final answers should be expressed with positive exponents only. (Assume that all variables represent positive quantities.) $$(x y)^{0}$$

In Exercises \(1-18,\) answer the following questions: (a) How many terms are there? (b) What is the degree of each term? (c) What is the degree of the polynomial? $$5 a^{4}-3 a^{3}+26 a$$

In Exercises \(1-18,\) answer the following questions: (a) How many terms are there? (b) What is the degree of each term? (c) What is the degree of the polynomial? $$2 x^{3}+y^{5}$$

Multiply out each of the following. As you work out the problems, identify those exercises that are either a perfect square or the difference of two squares. $$(x-6)(x-2)$$

Multiply and simplify each of the following. Whenever possible, do the multiplication of two binomials mentally. $$t^{2}(5 t)\left(2 t^{4}\right)(-t)$$

Simplify each of the following expressions as completely as possible. Final answers should be expressed with positive exponents only. (Assume that all variables represent positive quantities.) $$5^{-2}$$

Convert each number into scientific notation. $$90$$