F(7) means that the x value is 7, so all you have to do is substitute 7 into the equation.
f(7)=10-2(7)
or more simply,
y=10-2(7)
y=10-14
y=-4
So the answer would be -4
Ms. Anderson: 480 miles / 7.5 hrs = 64 mph
This differs from A (60 mph)
This is the same as B (64 mph) <= answer
This differs from C (66.7 mph)
This differs from D (73.8 mph)
Answer:

Step-by-step explanation:
Let 's' be the side of the original square
the length of the side of a square is doubled, so the length of the new square is 2s
Area of the original square with side length 's' is 
Area of the new square with side length '2s' is 
Area of the new square is 4 times the area of the original square
ratio of the areas of the original square to the area of the new square

Answer:
Slope: 2
Y-intercept: -4
Step-by-step explanation:
Slope = y2 - y1 / x2 - x1
Slope = -2 - -4 / 1 - 0
Slope = 2 / 1
Slope = 2
Y-intercept is when x = 0
This is shown on the first row
When x = 0, y = -4, which is our y-intercept