Q71: Simplify.<br>- <span class="ql-formula" data-value="-(2 \mathrm{x}-8)"><span class="katex"><span
Q72: Evaluate the polynomial.<br>- <span class="ql-formula" data-value="4
Q73: Evaluate.<br>- <span class="ql-formula" data-value="9^{1}"><span class="katex"><span class="katex-mathml"><math
Q74: Multiply.<br>- <span class="ql-formula" data-value="\left(2 y^{2}-4\right)\left(2 y^{2}+4\right)"><span
Q75: Collect like terms.<br>- <span class="ql-formula" data-value="7
Q77: Collect like terms.<br>- <span class="ql-formula" data-value="-7
Q78: Multiply.<br>- <span class="ql-formula" data-value="(\mathrm{x}-4)\left(9 \mathrm{x}^{2}+\mathrm{x}+7\right)"><span class="katex"><span
Q79: Write the number in scientific notation.<br>-6646<br>A)
Q80: Find the degree of the polynomial.<br>-
Q81: Subtract.<br>- <span class="ql-formula" data-value="\left(-8 x^{4}+2 x^{6}-4-8