I think it is d because it would be 15 x b = 60. Hope I got this right
Yes because if a negative sign is in a fraction doesnt matter where, it still show that the fraction is negative
The points of (9,1) after a 270 degree counterclockwise rotation would be (1,-9)
Hope this helps!
15/x = 20/100
15*100 = 20*x
1500 = 20x
1500/20 = 20x/20
75 = x
15/75 = 20/100
the expected number of couples who met online is 75
