Find All Numbers That Satisfy the Following $s ( t )$

question 218

Multiple Choice

Find all numbers that satisfy the following.
-An arrow is fired straight up from the ground with an initial velocity of 96 feet per second. Its height, $s ( t )$ , in feet at any time $t$ is given by the function $s ( t ) = - 16 t ^ { 2 } + 96 t$ . Find the interval of time for which the height of the arrow is less than 80 feet.

• A) after \(5 \mathrm { sec }\)
• B) between 1 and \(5 \mathrm { sec }\)
• C) before \(1 \mathrm { sec }\)
• D) before \(1 \mathrm { sec }\) or after \(5 \mathrm { sec }\)

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Definitions:

Labor Efficiency Variance

The variance between the number of hours actually worked and the anticipated standard hours, times the normal rate per hour.

Labor Rate Variance

A metric used to measure the difference between the actual rate paid to workers and the expected (or standard) rate.

Direct Labor

The labor cost attributed directly to the production of goods or services.

Standard Cost

A predetermined cost of manufacturing a single unit or a number of units of a product, calculated for managerial accounting purposes.