Use half-angle formulas to find the exact value for the following:
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What will be an ideal response?
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Convert as indicated.0.8 kg to ounces
A. 28.48 oz B. 36 oz C. 17.6 oz D. 1.76 oz
Simplify the expression.cos(x + ?) cos(? - x) + sin(x + ?) sin(? - x)
A. 1 B. cos(2x + 2?) C. 0 D. sin(2x + 2?)
Solve the problem.Christina made a chart summarizing her shop's financial performance over the past three years. 
How much money was made in the months described as "Good"?
A. $400 B. $9600 C. $7200 D. $1200
Write the best-fit linear model for the data.Two separate tests are designed to measure a student's ability to solve problems. Several students are randomly selected to take both tests and the results are shown below. Find a linear function that approximates a student's score on Test B as a function of his or her score on Test A. 
A. y = -19.4 - 0.930x B. y = 19.4 + 0.930x C. y = -0.930 + 19.4x D. y = 0.930 - 19.4x