Answer:

Step-by-step explanation:





Formula for perimeter of a rectangle: P = 2W + 2L
Here, P = 2(x-3 ) cm + 2(3x+7) cm = 2x - 6 + 6x + 14 (cm)
Combine like terms: 8x + 8 cm (simplest form) This is the perimeter.
Now let x = 4: P(x=4) = 8(4) + 8 cm = 40 cm
Answer:
what grade is this lol I don't know
Answer:
-94
Step-by-step explanation:
1) 2x² -5x+12
2) x² +7x+10
3) 3x² +5x-2