Complete the identity.sin (? + ?) cos (? - ?) = ?
A. sin2? cos2? - sin2? cos2 ?
B. sin ? cos ? + sin ? cos ?
C. sin ? cos ? - sin ? cos ? + sin ? cos ? + sin ? cos ?
D. sin2? - cos2?
Answer: B
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Determine whether the following is always true or not always true. Given reasons for your answers.c(u × v) = cu × cv (any number c)
What will be an ideal response?
Write the standard form of the equation of the circle.Center (9, 0), r = 10
A. x2 + (y + 9)2 = 10 B. (x - 9)2 + y2 = 100 C. (x + 9)2 + y2 = 100 D. x2 + (y - 9)2 = 10
Solve the problem.Evaluate sin 
.
A. Undefined B. 0.1 C. -0.1 D. 0
Solve the problem.Since 2001, electronic payments made to an online company have increased exponentially.
Let f(t) be the number of electronic payments in the year that is t years since 2006. A possible equation of f is 
Predict the number of electronic payments that will be made in 2020.
A. 467 thousand B. 1269 thousand C. 3449 thousand D. 23 thousand