Solve the Problem $A = \pi r ^ { 2 }$

question 505

Multiple Choice

Solve the problem.
-The area $A = \pi r ^ { 2 }$ of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when $r = 4 \mathrm { ft }$ ?

• A) \(8 \pi \mathrm { ft } ^ { 2 } / \mathrm { ft }\)
• B) \(4 \pi \mathrm { ft } ^ { 2 } / \mathrm { ft }\)
• C) \(8 \mathrm { ft } ^ { 2 } / \mathrm { ft }\)
• D) \(16 \pi \mathrm { ft } ^ { 2 } / \mathrm { ft }\)

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Definitions:

Medical Supplies

Items and equipment used in medical care, including instruments, dressings, and other medical-related materials.

Budgeting

The method of developing a strategy for managing your finances, detailing your future economic objectives and plans for reaching them.

Revenue Variance

The difference between actual revenue earned and the budgeted or expected revenue.

Budgeting

The process of creating a plan to spend your money, outlining projected income versus expenses over a period.