Answer:
The diagonal side length shouldn't be 14. Or one of the side lengths shouldn't be what it is.
Step-by-step explanation:
Answer: k = -5
explanation-
distribute: -3k + -21 - 5k + 4= 23
combine: -8k -17 = 23
add 17 to both sides: -8k = 40
divide both sides by -8: k=-5
Cost times 1.28 gives total cost