Exam 2: Making Sense of It All

Evaluate the expression for the given values of the variables.

Find the area of the circle. Use 3.14 for Round to the nearest whole unit.

Mt. Kosciusko in Australia is 2230 m in elevation. How many kilometers is this?

Solve the inequality. Write your answer in interval notation.

Convert the metric unit of length using the prefix line.

To be completely accurate, a model railroad needs to scale down speed in addition to size. Rail speed limits depend on track quality, but the highest speed limit in the U.S. is 200 mph. What should the highest speed be for a 1:48 O scale train in feet per second? Round to the nearest tenth.

Find the unit cost to three decimal places. A box of laundry detergent costs $3.99 for 100 oz.

Solve the inequality. Write your answer in interval notation.

Convert the metric unit of length using unit ratios.

Solve the inequality. Write your answer in set-builder notation.

Write the ratio in two other ways. 3 to 7

Solve the inequality. Write your answer in interval notation.

Convert the unit of time.

Convert the unit of mass.

Convert the metric unit of length using unit ratios.

Solve the inequality. Write your answer in interval notation.

In model trains, O scale means the models are made using a 1:48 scale. In the U.S., real train tracks have rails that are 4 ft 8 in apart. a. If miniature train track was made using O scale, how far apart should the rails be? Round to the nearest hundredth of an inch. b. The word gauge refers to how far apart the model rails are. For some reason, O gauge track does not exactly use O scale, and O gauge rails are 1.25 inches apart. Find the relative difference of the rail spacing on O gauge track compared to what it should be if it followed O scale. Round to the nearest tenth of a percent.

A coyote can run 101 m in 5.3 seconds. A jack rabbit can run 50 m in 3.1 seconds. Compare their unit speeds to determine which animal is faster. Round to the nearest whole unit.

The class size at a certain school increased from 33 to 73. What was the percent increase? Round to the nearest whole percent.

Find the outer circumference of a pipe 8.5 in. in diameter. Use 3.14 for