Answer:
19 is 4/dc^2
21 is y+4/4
23 is x+2/x-2
Step-by-step explanation:
413,114
i think... lol
y=6x+21
simply 3x2+6x+15
30
200x.15=30
200-30=170
i believe it is 4. the formula is 2x -4
