Answer:
Company A: 
Company B: 
Step-by-step explanation:
The initial fee is the y-intercept, as that is the cost at x = 0, or the cost before any time has passed. Afterwards, the rate the cost increases is the slope.
Linear equation in slope-intercept form:

where m is the slope and b is the y-intercept.
Company A charges $50 up front and $40 per hour afterwards, so the equation would be:

Company B charges $25 up front and $50 per hour, so:

Answer:
g(x) = 4rx + 4r - 4x - 4
Step-by-step explanation:
g(x)= -(x+1)(r-1)(-4)
Answer:
21) x = 0
23) x = 7
Step-by-step explanation:
In a parallelogram, the opposite sides are congruent. Using this fact, we can create equations for both problems.
21)

Subtract 18.

Divide by 2.

23)

Add 3.

Divide by 2.

1 cm = 1.5 ft is your scale
2.5 cm (on the paper) * 1.5 ft (scale) = 3.75 ft
4.5 cm (on the paper) * 1.5 ft (scale) = 6.75 ft
Since area = length * width
3.75 ft * 6.75 ft = 25.3125 ft^2
The area of the rectangular section in square feet that Cheryl will apply texture paint to would be 25.3125 ft^2