Answer:
f = 1
Step-by-step explanation:
Cross multiply.
f (20) = 5 (f + 3)
20f = 5 (f+3)
20f = 5 (f ) + 5 (3)
20f = 5f + 15
-5f - 5f
15f = 15
15f/15 = 15/15
f = 15/15
.75
Not sure
0.17
20+10=30 30-5=25. 125-25=100
-2
0.9x + 2.3x = -6.4
3.2x = -6.4
x = -2
y=-7
horizontal line means that it doen't cross the x axis, so you just ignore the x value
C
