Arithmetic Sequence: original formula: Sn=n/2 (2u1+(n-1)d)

problem formula: S20= 20/2 (2x60 (20-1)(-3)) =630.

The sum of the sequence is 630, but, i need help understanding HOW it is 630. i dont know what to multiply/add/divide in the series first, i don't understand how they got the answer to be 630. Could someone give a detailed explanation on how to work out the problem and parentheses step by step? Thank you

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A.s.a.! this is a similarity in right triangles. next (solve for x)a.) 12b.) 5c.) 12.5d.) [tex] 6\sqrt{3} [/tex]

The two box p digram the two box plots show the data of the pitches thrown by two pitchers throughout the season. which statement is correct? check all that apply. pitcher 1 has a symmetric data set. pitcher 1 does not have a symmetric data set. pitcher 2 has a symmetric data set. pitcher 2 does not have a symmetric data set. pitcher 2 has the greater variation.ots represent the total number of touchdowns two quarterbacks threw in 10 seasons of play