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Find the sum or difference. Write the answer in standard form.
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Q9: <span class="ql-formula" data-value="x"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>x</mi></mrow><annotation encoding="application/x-tex">x</annotation></semantics></math></span><span
Q36: <span class="ql-formula" data-value="2 x + 1 -
Q41: The outside of a picture frame has
Q52: <span class="ql-formula" data-value="x ^ { 2 }
Q69: <span class="ql-formula" data-value="x ^ { 2 }
Q75: A can has a surface area of
Q191: <span class="ql-formula" data-value="y = - 3 x
Q312: <span class="ql-formula" data-value="\frac { 7 } {
Q419: <span class="ql-formula" data-value="6 < x \leq 8"><span
Q440: A rock falls from a tower