Express the vector in the form ai + bj.
if A is the point (-7, -8) and B is the point (-2, -15)
A. v = 5i - 7j
B. v = 5i + 7j
C. v = 7i - 5j
D. v = -5i + 7j
Answer: A
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Write the solution set in interval notation.{x|x ? -5}
A. (-?, -5) B. (-5, ?) C. [-5, ?) D. (-?, -5]
Solve the formula for the specified variable.a + b = s + r for s
A. s = 
B. s = 
+ b
C. s = a + b - r
D. s = r(a + b)
Solve the problem.The table below gives the violent crime rate (per 100,000 people) for a particular state every five years from 1970 to 2010. 
Use technology to find the cubic function that is the best fit for this data, where x is the number of years after 1970. Round to five decimal places.
A. y = -0.00024x3 + 0.02250x2 - 0.03111x + 4.68687 B. y = -0.00034x3 + 0.01950x2 - 0.04893x + 4.79798 C. y = -0.00053x3 + 0.02460x2 - 0.01893x + 5.79798 D. y = 4.79798x3 - 0.04893x2 + 0.01950x - 0.00034
Solve the problem.The cost for labor associated with fixing a washing machine is computed as follows: There is a fixed charge of $25 for the repairman to come to the house, to which a charge of $29 per hour is added. Find an equation that can be used to determine the labor cost, C(x), of a repair that takes x hours.
A. C(x) = 25 + 29x B. C(x) = 25 - 29x C. C(x) = 29 + 25x D. C(x) = ( 25 + 29) x