Write the expression in the standard form a + bi.(5 + 6i)(5 - 6i)
A. -11
B. 61
C. 25 - 36i
D. 25 - 36i2
Answer: B
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Find the unit tangent vector of the given curve.r(t) = (cosh t)i + (sinh t)j + k
A. T(t) = - 
(tanh t sech t)i + 
j + 
(sech t)k
B. T(t) = - 
(tanh t)i + 
j + 
(sech t)k
C. T(t) = 
(tanh t sech t)i + 
j + 
(sech t)k
D. T(t) = 
i + 
j
Provide an appropriate response.Find the perimeter of the given figure if it is measured in feet:
A. 33 feet B. 45 feet C. 51 feet D. 56 feet
Find the equivalent markup. Round to the nearest tenth of a percent.Markup on cost: 8.3%Markup on selling price: 
A. 5.9% B. 7.7% C. 92.3% D. 94.1%
Solve the problem.The mathematical model 
represents the cost in dollars a company has in producing x items during a month. Based on this, how much does it cost to produce 
? Interpret the question and answer using function notation.
A. $320,000; f(320,000) = 800 B. $360,000; f(800) = 360,000 C. $360,000; f(360,000) = 800 D. $320,000; f(800) = 320,000