Answer: 
Step-by-step explanation:
First you put it in to y= mx+b form.

Then you subtract 34 from both sides

Then you divide 8 from both sides
Leaving you with

Let us say that the number of weeks is "x" and the number of chores is "y".
If we state an algebraic expression for Janie's allowance it would be
3x+2y=13
However, there are two variables, hence many answers. To solve this problem, there must be more information about the relation between x and y.
I believe it is C hope it helps
Answer:
-14
Step-by-step explanation:
a·b = |a|×|b|×cos(angle between them)
= 4×7×(-1/2)
= -14