The pieces are 2.5 and 7.5 the 7.5 is the piece that is 3 times the length of the first one
Answer:
(-1, -2.5)
Step-by-step explanation:
the midpoint of a segment is 
, given points (x1, y1) and (x2, y2)

The coordinates midpoint of AB are (1,2)
Answer:
16 problems.
Step-by-step explanation:
100% divided by 20 questions.
100/20 is equal to 5, therefore each question is worth 5 points.
Grade of 80% divided by points per question.
80/5 is 16 so the student answered 16 questions correctly.
The mistake is there is no parenthesis around 4x+12