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The length of a rectangular room is 9 feet greater than its width. Which of the following equations represents the area (A) of the room?

A. A=9x

B. A=2x+2(x+9)

C. A=x(x+9)

D. A=x+(x+9)

Answer Explanation:

we are asked to find the area of the room from the given information.

The first step is to find equation relating the length of the room to its width. If we let the width of the room to be x. Then,

Width of the rectangle= x

Length of rectangle = (x+9)

Area of the rectangle, A= Length*width = (x+9)*x

A=x(x+9)

Therefore, the area of the rectangular room is x(x+9).

Therefore, the Correct Answer is C.

Q #1: Which of the following is an appropriate unit of measure to express the radius of a needle?

A. Millimeters

B. Hectometers

C. Hexameters

D. Meters

Answer Explanation

Radius of a needle is a small mearument hence millimeters would be best suited to measure it.
Q #2: A person weighed themselves at 190 lb. Three months later they weighed themselves at 180 lb. Which of the following is the percent of weight the person lost over 3 months? (Round to the nearest percent.)

A. 8%

B. 9%

C. 11%

D. 5%

Answer Explanation

Explanation: The percentage change in weight is found in three steps below:
Absolute change in weight = final weight - initial weight

Absolute change in weight = (|180 - 190| = |-10| = 10)

Relative change in weight = (frac{absolute change}{initial weight} = frac{10}{190} = 0.0526)

Percent change = relative change * 100%

Percent change = 0.0526 * 100% = 5.26%

The percent change in weight lost is 5.26%, which is about 5%.
Q #3: To determine the cost of producing the phone, the manufacturing company considers the location of raw materials, tax percent, and the price of chips. Which of the following is the dependent variable?

A. Price of chips

B. Cost of the phone

C. Raw materials

D. Tax percent

Answer Explanation

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