Use a Graphing Utility to Solve the Equation on the Interval

question 393

Multiple Choice

Use a graphing utility to solve the equation on the interval 0 $0 ^ { \circ } \leq x < 360 ^ { \circ }$ . Express the solution(s) rounded to one decimal
place.
- $3 \cos ^ { 2 } x + 2 \cos x = 1$

• A) 49.8°, 130.2°, 229.8°, 310.2°
• B) 51.8°, 128.2°
• C) 70.5°, 180.0°, 289.5°
• D) 103.2°, 145.2°, 283.2°, 325.2°

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Definitions:

Confidence Interval

Various values, obtained from sample measures, that are likely to contain the essence of an unknown population parameter.

Confidence Interval

A selection of values, taken from data sampling, that is presumed to hold the value of a hidden population attribute.

Sample Size

The number of observations or data points collected or selected from a population for the purpose of statistical analysis.

Degrees of Freedom

The number of independent pieces of information in a dataset that are available for estimating another piece of information or parameter.