Show that the equation is not an identity by finding values of x and y for which both sides are defined but not equal.
When x = 0 and y = ?, cos(0 – ?) = cos(–?) = –1.
But cos(0) – cos(?) = 1 – (–1) = 2.
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Find the corresponding position vector. Define the points P = (2, -7) and Q = (-3, 10). Find the position vector corresponding to 
.
A. 
B. 
C. 
D. 
Solve the problem.Together, JoAnne and Josh drove 916 miles to take the family on a vacation. Josh drove 181 miles more than twice the number of miles that JoAnne drove. How many miles did each of them drive?
A. JoAnne: 426 miles, Josh: 490 miles B. JoAnne: 195 miles, Josh: 721 miles C. JoAnne: 245 miles, Josh: 671 miles D. JoAnne: 490 miles, Josh: 426 miles
Approximate the area of the triangle to the nearest tenth.a = 13.2, b = 17.4, c = 16.2
A. 107.5 B. 101.5 C. 104.5 D. 110.5
Solve the problem.The value V, in dollars, of a shopkeeper's inventory software program is given by the formula 
where t is the number of years since the shopkeeper first bought the program. Find the number of years after which the value of the inventory program is $280 by solving the equation 
graphically, using the following graph. 
A. 9 years B. 6 years C. 10 years D. 550 years