Answer:
- (e) 14.4 units²
- (d) 153.5 ft²
Explanation:
A calculator is a useful tool for evaluating formulas with numbers given. The attached shows results using a TI-84. Put the numbers in place of the corresponding variables and do the arithmetic.
a) 14.4 square units
b) 153.5 square feet
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Additional comment
Be sure your calculator is set to the mode corresponding to the angle measure you're using. Here, it is "degrees." (Often, the default is radians.)
It is a good idea to learn to use a suitable scientific or graphing calculator. Some nice TI-84 work-alike calculator apps are available for iOS and Android platforms. Your school may have a list of exam-approved calculator models that would be useful, or your online curriculum materials may provide a calculator.