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Find the common difference for the arithmetic sequence.
--7, -11, -15, -19, . . .
Q7: <br><img src="https://d2lvgg3v3hfg70.cloudfront.net/TB7514/.jpg" alt="
Q11: <span class="ql-formula" data-value="f ( x ) =
Q19: <span class="ql-formula" data-value="f ( x ) =
Q61: The roof of a building is
Q137: <span class="ql-formula" data-value="y=3 x^{2}-1"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>y</mi><mo>=</mo><mn>3</mn><msup><mi>x</mi><mn>2</mn></msup><mo>−</mo><mn>1</mn></mrow><annotation
Q147: <span class="ql-formula" data-value="f(x)=-(x-6)^{2}-2"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>f</mi><mo stretchy="false">(</mo><mi>x</mi><mo
Q164: <span class="ql-formula" data-value="f(x)=|x|-3"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>f</mi><mo stretchy="false">(</mo><mi>x</mi><mo
Q250: <span class="ql-formula" data-value="a _ { n }
Q294: Four boys and three girls are
Q477: Use the slopes of the line segments