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Evaluate or simplify the expression without using a calculator.
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Q21: <span class="ql-formula" data-value="\log _ { 10 }
Q33: <span class="ql-formula" data-value="3 x ^ { 2
Q40: <span class="ql-formula" data-value="f(x)=|x|, g(x)=|x|+4"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>f</mi><mo
Q115: For which values of <span
Q143: <span class="ql-formula" data-value="\begin{aligned}- 2 x - 4
Q158: The diagonal of the floor of a
Q169: <span class="ql-formula" data-value="\log _ { 10 }
Q181: <span class="ql-formula" data-value="y _ { 1 }
Q205: <span class="ql-formula" data-value="\mathrm { S } =
Q286: One number exceeds another by -12. The