Q18: Multiply.<br>- <span class="ql-formula" data-value="\left(5 x^{4}-4\right)\left(x^{5}-3\right)"><span class="katex"><span
Q19: Evaluate.<br>- <span class="ql-formula" data-value="x^{2}-9"><span class="katex"><span class="katex-mathml"><math
Q20: Solve the problem. Express the answer
Q21: Find the degree of the polynomial.<br>-
Q22: Multiply or divide and write scientific
Q24: Divide.<br>- <span class="ql-formula" data-value="\frac{30 x^{7}+20 x}{5}"><span
Q25: Multiply.<br>- <span class="ql-formula" data-value="\left(5 n^{4}+4\right)\left(5 n^{4}\right."><span
Q26: Multiply mentally.<br>- <span class="ql-formula" data-value="\left(x-2 x^{3}\right)^{2}"><span
Q27: Choose the one alternative that best
Q28: Multiply.<br>- <span class="ql-formula" data-value="(4 \mathrm{x}-8)(\mathrm{x}+12)"><span class="katex"><span