Answer:
37
Step-by-step explanation:
f(4) just means use 4 for x. The table has all the x's across the top (sometimes they are in columns instead) The f(x) in the second row is the output that goes with each x. When x is 4, the f(x) is 37.
All is one math sentence:
f(4) = 37
X=22.5
Y=kX
20=15k
k=4/3
For X when Y=30
30=4/3×X
Cross multiply
4X=90
yes
-6x +10x= 4x
-2x(3 - 5x)
