For a direct variation, f(x) = kx. Therefore, for f(x) = 30x, constant of variation (k) = 30.
Answer:
See attached picture.
Step-by-step explanation:
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For remaining parts resubmit question.
79.50 x .06 = 4.77
79.50 + 4.77 = $84.27
The total cost was $84.27
Answer:

Step-by-step explanation:

Answer: 400 square feet
Step-by-step explanation: One gallon can of paint will cover up to 400 square feet, which is enough to cover a small room like a bathroom. Two gallon cans of paint cover up to 800 square feet, which is enough to cover an average size room