Determine the number of terms, n, given the geometric series -1 - 2 - 4 - 8 - ... and Sn=−31. A. 9
B. 6
C. 5
D. 7

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.

93-8=85

855=17

17*4=68

there are 68 purple marbles in that bag

the correct answer would be d because the slope is -2/2=1 and the y intercept is at 2 so that is the correction equation

the one where 1 and 2 are directly across from each other.  

see image