Which equation represents a line which is perpendicular to the line y = - 1/2 x - 6? x - 2y = 8
2x + y = 6
x + 2y = 4
y - 2x = -1

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

Brent wants to know what is 5 x 1/2

What is the y intercept of f(x)=(1/2)^x?