Find the exact value of the logarithm without using a calculator. \( \log _{9} 81 \) \( \log _{9} 81=\square \) (Type an integer or a simplified fraction.)

Consider the following function. \[ f(x)=1-x^{2 / 3} \] Find \( f(-1) \) and \( f(1) \) \( f(-1)=\square \) \( f(1)=\square \)

5. \( (2+4(2-5)):(4-(3-4))= \)

Which of the following logarithmic expressions is undefined? (1 point) \( 0 \log _{3} 27 \) \( \log _{3}-9 \) \( \log _{0.25} 64 \) \( 0 \log _{2.5} 6.25 \)

Q1. Write a number in the box to make this correct \[ \frac{3}{5}<\frac{\square}{100}<0.7 \]

Which of the following is the value of \( \log 10^{20} \) ? (1 point) \( \frac{1}{2} \) 2 200 20