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Use the properties of logarithms to find the exact value of the expression. Do not use a calculator.
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Q13: <span class="ql-formula" data-value="y"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>y</mi></mrow><annotation encoding="application/x-tex">y</annotation></semantics></math></span><span
Q20: <span class="ql-formula" data-value="\mathrm { pH } =
Q30: <span class="ql-formula" data-value="R ( x ) =
Q35: <span class="ql-formula" data-value="y = - 3 \cos
Q49: <span class="ql-formula" data-value="y=2 \sin (2 x-\pi)"><span class="katex"><span
Q304: <span class="ql-formula" data-value="\tan 40 ^ { \circ
Q354: <span class="ql-formula" data-value="\log _ { 4 }
Q434: <span class="ql-formula" data-value="f ( x ) =
Q478: <span class="ql-formula" data-value="\log _ { 4 }
Q493: <span class="ql-formula" data-value="\log ( x + 5