Find the real solutions, if any, of the equation. Use the quadratic formula.x2 + 4x - 9 = 0
A. {2 + 
}
B. {-1 - 
, -1 + 
}
C. {-2 - 2
, -2 + 2
}
D. {-2 - 
, -2 + 
}
Answer: D
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Solve the problem.Suppose that R ={(x, y): 0 ? x ? 7, 0 ? y ? 7},R1 = {(x, y): 0 ? x ? 7, 0 ? y ? 6}, andR2 = {(x, y): 0 ? x ? 7, 6 ? y ? 7}. Suppose, in addition, that
dA = 7, 
dA = 9, and 
dA = 2.Use the properties of integrals to evaluate 
dA.
A. 9 B. 18 C. 11 D. 7
Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 85% of the isotope left?
A. 1,500 yr B. 813 yr C. 234 yr D. 750 yr
Use a graphing calculator to solve the equation. Round your answer to two decimal places.e2x = x + 3
A. {0.65} B. {3.27} C. {0.27} D. {3.65}
Answer the question.What type of figure is formed by joining the midpoints of the adjacent sides of a square?
Fill in the blank(s) with the appropriate word(s).