91Ó°ÊÓ

Perform the indicated computations. Write the answers in scientific notation. $$\left(3 \times 10^{-2}\right)^{4}$$

In Exercises \(123-124,\) solve each system by the method of your choice. \(\left\\{\begin{array}{l}2 x+3 y=1 \\ y=3 x-7\end{array}\right.\) (Section 4.2, Example 1)

Determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. The number of people who catch a cold \(t\) weeks after January 1 is \(5 t-3 t^{2}+t^{3} .\) The number of people who recover \(t\) weeks after January 1 is \(t-t^{2}+\frac{1}{3} t^{3}\). Write a polynomial in standard form for the number of people who are still ill with a cold \(t\) weeks after January 1

Find the missing factor. $$(\quad ) \left(-\frac{1}{4} x y^{3}\right)=2 x^{5} y^{3}$$

Solve: \(4 x-7>9 x-2 .\) (Section 2.7, Example 7)

Perform the indicated computations. Write the answers in scientific notation. $$\left(2 \times 10^{-3}\right)^{5}$$

In Exercises \(123-124,\) solve each system by the method of your choice. \(\left\\{\begin{array}{l}3 x+4 y=7 \\ 2 x+7 y=9\end{array}\right.\) (Section 4.3, Example 3)

Determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. Explain why it is not possible to add two polynomials of degree 3 and get a polynomial of degree 4

Graph \(3 x-2 y=6\) using intercepts. (Section 3.2 Example 4 )

Perform the indicated computations. Write the answers in scientific notation. $$\left(4 \times 10^{6}\right)^{-1}$$