7 because when you have two negative together they change to positive. I learned like this the -enemy of my -enemy is my +friend.
See attachment
distance from ice cream to your house=distance from ice cream to friend+distance from friend to your house
distance from ice cream to your house=12
distance from ice cream to friend=?
distance from friend to your house=3
12=?+3
minus 3 both sides
12-3=?+3-3
9=?+0
9=?
answer is 9 miles
Original line: y=1/2x-9
Perpendicular lines have opposite slopes from the original lines. Since the original slope is 1/2, the perpendicular slope will be -2/1 or -2. The numbers switch places and switches from positive to negative.
New line: y=-2x+b
To solve for the y-intercept (b), plug the given coordinates (3,2) into the x and y spots in the equation:
2=-2(3)+b
Now, solve for b.
2=-6+b
Add 6 to both sides.
8=b
The y intercept is 8.
Now, your perpendicular line equation is:
y=-2x+8
I hope this helps :)
The interpretation of the solution is that there are 15 true/false questions and 5 multiple choice questions.
I'm getting 40.9 but double check, (<span>π x r^2) x height?</span>