Answer:

Step-by-step explanation:
The equation of line in the form .
y = mx + c
Where m is the slope and c is the y- intercept .
As given
The lines y=3x-1 and y=ax+2 are perpendicular .
Here 3 is slope for equation of line y=3x-1 and a is slope for equation of line
y=ax+2 .
Now by using properties of the perpendicular lines property .
When two lines are perpendicular than slope of one line is negative reciprocal of the other line .
Thus

Therefore 
So George did't put parentheses around total snack amount to subtract his $15.He would need the total purchases to subtract amount by $15.
Answer:
I DONT KNOW THAT
Step-by-step explanation:
Answer:
81
Step-by-step explanation: