Express the following sums using sigma notation.
a. 9 plus 10 plus 11 plus 12 plus 13
b. 2 plus 4 plus 6 plus 8 plus 10 plus 12
c. 1 superscript 6 baseline plus 2 superscript 6 baseline plus 3 superscript 6 baseline plus 4 superscript 6
d. one fifth plus one sixth plus one seventh plus one eighth

Which two properties of equality could zoe use to finish solving for x? the equation is 3x - 4 = -10 for x so a either the addition or subtraction property of equalityb ether the multiplication or division property of equality c ether the addition or division property of equality d ether the subtraction or division property of equality just a simple a b c or d plz.