please help! write an expression for the 15th partial sum of the series 5/3 + 4/3 + 1 + ... using summation notation.

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

Select the two pairs of figures that are similar.

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.