Use the given vectors to find the specified scalar.u = 13i - 13j and v = -15i + 4j; Find u ? v.
A. -143
B. -195
C. -247
D. -52
Answer: C
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Perform the indicated operations. [(1.7x3 + 7.6x2 + 4.3) + (6.5x - 2.8)] - (3.5x2 -x - 9.9)
A. 1.7x3 + 4.1x2 + 7.5x + 11.4 B. 13.3x6 + 11.4 C. 1.7x3 + 4.1x2 + 6.5x + 11.4 D. 1.7x3 + 11.1x2 + 5.5x - 8.4
Use an Euler diagram to determine whether the argument is valid or invalid.All businessmen wear suits.Aaron wears a suit. Aaron is a businessman.
A. Valid B. Invalid
Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Solve.Each day the commuter train transports x passengers to or from the city at $1.75/passenger. The daily fixed cost for running the train is $1200. Write an equation that relates the daily profit, P, in dollars to the number of passengers each day. Then use the equation to find the daily profit when the train has 920 passengers in a day.
A. P = 1.75x; $1610 B. P = 1.75x - 1200; $410 C. P = 1.75x + 1200; $2810 D. P = 1200 - 1.75x; $410