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Solve the problem.
-Find the sum of the first 30 terms of the arithmetic sequence -7, 2, 11, 20, . . .
Q8: <span class="ql-formula" data-value="36 + 27 + 18
Q77: -1.1c + 4 - 3c - 2.8<br>A)
Q128: <span class="ql-formula" data-value="x^{2}+y^{2} \leq 4"><span class="katex"><span class="katex-mathml"><math
Q163: <span class="ql-formula" data-value="\frac { 2 } {
Q173: <span class="ql-formula" data-value="\log _ { 5 }
Q210: Claire has received scores of 85, 88,
Q257: <span class="ql-formula" data-value="f(x)=4^{x+1}"><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
Q264: x - 18 = 3<br>A) -21<br>B) 15<br>C)
Q276: <span class="ql-formula" data-value="\mathrm { f } =
Q279: <span class="ql-formula" data-value="\log _ { 8 }