Q497: Evaluate - (-x) for the given
Q498: Simplify.<br>- <span class="ql-formula" data-value="-7+19-(-12)-6+5"><span class="katex"><span class="katex-mathml"><math
Q499: Remove parentheses and simplify.<br>- <span class="ql-formula"
Q500: Perform the indicated operation and, if
Q501: Factor. Check by multiplying.<br>- <span class="ql-formula"
Q503: Collect like terms.<br>- <span class="ql-formula" data-value="\frac{1}{2}
Q504: Solve the problem.<br>-A bike road race starts
Q505: Evaluate.<br>- <span class="ql-formula" data-value="13^{2}"><span class="katex"><span class="katex-mathml"><math
Q506: Add.<br>- <span class="ql-formula" data-value="4.23+0.82+24.52"><span class="katex"><span class="katex-mathml"><math
Q507: Solve the problem.<br>-At a national computer show,