Answer:
D
Step-by-step explanation:
I think D is the answer.
Step-by-step explanation:
Below is an attachment containing the solution.
2.5 because if you move x to the other side of the equation you will get y=2.5x, and the constant of proportionality is what x is multiplied by, in this case, it's 2.5.
Answer:
13.6 inches
Step-by-step explanation:
We can use Pythagorean theorem: 
Let c be the diagonal length, a for length, and b for width.
Substitute the values.

c=13.6 inches
The cost of the blanket is $20
The cost of each letter is $1.50