Five friends, Billi, Joe, Eduardo, Mari, and Zavier, want one photograph taken of each possible pair of firends. How many photographs need to be taken? A. 10 B. 8 C. 12 D. 5​

Agiven line has the equation 2x + 12y = −1. what is the equation, in slope-intercept form, of the line that is perpendicular to the given line and passes through the point (0, 9)? y = ( )x + 9

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?

What is r i 4.5+10r=-6.5 with work pls