Find the sum of the first $20$20 terms of the arithmetic sequence defined by $T_1=\pi$T1=π and $T_{20}=20\pi$T20=20π.

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Use the summation feature of a graphing calculator to find the sum of the first ten terms, $S_{10}$S10, of the arithmetic series defined by $T_n=4.2n+8.81$Tn=4.2n+8.81.

Use the summation feature of a graphing calculator to find the sum of the first ten terms, $S_{10}$S10, of the arithmetic series defined by $T_n=\sqrt{7}n+\sqrt{5}$Tn=√7n+√5.

Give your answer to the nearest thousandth.

Use the summation feature of a graphing calculator to find the sum of the first ten terms, $S_{10}$S10, of the arithmetic series defined by $T_n=-\sqrt[3]{5}n+\sqrt{3}$Tn=−^{3}√5n+√3.