Using the factoring method, solve for the roots of the quadratic equation.2x2 - 18x + 40 = 0
A. x = 2, x = 4, x = 5
B. x = 4, x = 5
C. x = -4, x = -5
D. x = 0, x = 4, x = 5
Answer: B
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Solve the problem.Find a curve through the origin in the xy-plane whose length from x=0 to x=1 is 
A. y = x2
B. y = ex -1
C. y = 
ex/2 - 
D. y = 
ex/2
Find the value of the objective function at each corner of the graphed region. What is the maximum value of the objective function? What is the minimum value of the objective function?Objective Function z = 5x + 6y
A. maximum value: 61; minimum value: 42 B. maximum value: 42; minimum value: 11 C. maximum value: 64; minimum value: 61 D. maximum value: 64; minimum value: 11
Simplify.13 × 63 - (6 - 2)
A. 208 B. 864 C. 212 D. 32
Solve the problem.The half-life of a certain radioactive substance is 5 years. Suppose that at time 
there are 28 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 28
t/10How many grams of the substance will remain after 45 years?Round to the nearest hundredth of a gram.
A. 1.24 g B. 0.15 g C. 0.62 g D. 0.31 g