Q118: Solve the problem. Express the answer
Q119: Multiply.<br>- <span class="ql-formula" data-value="(5 \mathrm{x}+10)(5 \mathrm{x}-3)"><span
Q120: Subtract.<br>- <span class="ql-formula" data-value="(8 x+9)-(16 x+9)"><span
Q121: Multiply.<br>- <span class="ql-formula" data-value="\left(x^{2}+3\right)^{2}"><span class="katex"><span class="katex-mathml"><math
Q122: Multiply or divide and write scientific
Q124: Multiply.<br>- <span class="ql-formula" data-value="(-9 y-7)\left(3 y^{2}-y-3\right)"><span
Q125: Collect like terms and then arrange
Q126: Add.<br>- <span class="ql-formula" data-value="\left(9 \mathrm{x}^{8}-7 \mathrm{x}^{3}+3
Q127: Express using positive exponents. Then simplify.<br>-
Q128: Evaluate the polynomial.<br>- <span class="ql-formula" data-value="-5