Solve the problem.Which of the following vectors is parallel to v = 9i + 5j?
A. w = 
i + 
j
B. w = 
i - 
j
C. w = 45i - 25j
D. w = - 
i + 
j
Answer: A
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Solve problems using a calculator.The number of therms has been established on a customer's gas bill, and the monthly bill is calculated as follows: Item ChargeCustomer charge $0.16326 per dayRegulatory fee $0.05267 per dayGas usage $0.89251 per therm for the first 48 therms $1.07352 per therm for each therm over 48 thermsSuppose that during a 31-day month a customer used 111 therms. What would the customer's total bill be? (Round to the nearest cent, if necessary.)
A. $118.05 B. $117.17 C. $118.94 D. $117.39
Factor completely.15x3 - 65x2 - 50x
A. (x2 - 5)(15x + 10) B. 5(3x - 2)(x + 5) C. x(3x + 2)(5x - 25) D. 5x(3x + 2)(x - 5)
Solve the problem.Mark can remember only the first 5 digits of his friend's phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark were to dial all of the possible numbers and if it takes him 17 seconds to try each one, how long would it take to try every possibility?
A. 25.5 min B. 2.8 min C. 28.3 min D. 5.7 min
Find the angle between the vectors u and v if 
, and 
Round your answer to two decimal places.
A. 1.41° B. 0.00° C. -1.24° D. -1.93° E. 0.96°