Find the acceleration vector in terms of ur and u?.r = a(8 - cos ?) and 
= 5
A. a = 64a( cos ? - 5a + a cos ?)ur + (128a sin ?)u?
B. a = 25a( cos ? + 8a - a cos ?)ur - (50a sin ?)u?
C. a = 25a( cos ? - a + a cos ?)ur + (50a sin ?)u?
D. a = 25a(2 cos ? - 8)ur + (50a sin ?)u?
Answer: D
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Solve by completing the square.x2 + 14x + 13 = 0
A. -13, -1
B. ±
C. 1, 13
D. 26, -13
Find a simplified value for x by inspection. Do not use a calculator.
?
?
x = __________
Fill in the blank(s) with the appropriate word(s).
Sketch the graph of the equation.4x + 3y = 12
A. 
B. 
C. 
D. 
Without solving, choose the correct solution by deciding which choice satisfies the given conditions.Raleigh has a total of 54 coins, all of which are either dimes or nickels. The total value of the coins is $4.60. Find the number of each type of coin.
A. 38 nickels; 16 dimes B. 16 nickels; 38 dimes C. 21 nickels; 33 dimes D. 18 nickels; 36 dimes