For part (a), find the sum of the first n terms of the geometric series. For part (b), find n for the given sum Sn 7+(-21)+63+(-189)+...
a. n=18
b. Sn= 3829​

Flashback to semester a. are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr? show your work.

Select all the statements that apply to this figure

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.