Answer:
3/4
Step-by-step explanation:
2/5+1/4+1/10=8/20+5/20+2/20=（8+5+2）/20=15/20=3/4
Slope: (y2-y1)/(x2-x1)
(6-8)/(4-2) = -2/2 = -1
The slope is -1
Answer:
72
Step-by-step explanation:
180-78-30=72
3r-6=-21
3r-6+6=-21+6 (Add 6 to both sides...)
3r=-15
r=-5
3r-6=21
3r-6+6=21+6 (Add 6 to both sides...)
3r=27
r=9
r=-5 or r=9
