Q80: Add. Do not use a number
Q81: Solve the problem.<br>-The stock market gained 40
Q82: Multiply.<br>- <span class="ql-formula" data-value="\frac{6}{5}(a-b+5)"><span class="katex"><span class="katex-mathml"><math
Q83: Solve the problem.<br>-A school accepts
Q84: Simplify.<br>- <span class="ql-formula" data-value="-9+(-12)+(-11)+(-8)+4+(-15)"><span class="katex"><span class="katex-mathml"><math
Q86: List the terms of the expression.<br>-
Q87: Convert to decimal notation.<br>- <span class="ql-formula"
Q88: Subtract.<br>- <span class="ql-formula" data-value="2.330-(-0.88)"><span class="katex"><span class="katex-mathml"><math
Q89: Multiply.<br>- <span class="ql-formula" data-value="-1.94 \cdot(-4.7)"><span class="katex"><span
Q90: Simplify.<br>- <span class="ql-formula" data-value="\frac{8 \cdot(6+2)+8 \cdot