Answer:
B
Step-by-step explanation:
He multiplied rather than dividing.

Hope this helps!
Answer:
D. 6x2 + 3x - 7
Step-by-step explanation:
Answer:
To calculate the perimeter of a triangle, add the length of its sides. For example, if a triangle has sides a, b, and c, then the perimeter of that triangle will be P = a + b + c.