Solve the problem.Suppose that R ={(x, y): 0 ? x ? 9, 0 ? y ? 8},R1 = {(x, y): 0 ? x ? 9, 0 ? y ? 7}, andR2 = {(x, y): 0 ? x ? 9, 7 ? y ? 8}. Suppose, in addition, that
dA = 5, 
dA = 9, and 
dA = 4.Use the properties of integrals to evaluate 
A. 45
B. 90
C. 0
D. 54
Answer: B
Mathematics
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Use the appropriate addition formula to find the exact value of the expression.cos 
A. 
- 
B. - 
- 
C. 
D. 
Mathematics
Solve the problem.Which of the lines in the picture are lines of symmetry of the given figure?
A. l and n B. m and o C. Only l D. l, m, n, and o
Mathematics
Graph the system of inequalities.y ? 2x - 1x + y ? 4
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A bridge constructed over a river has a supporting arch in the shape of a parabola. The length of the road over the parabolic arch is 252 feet and the maximum height of the arch is 114 feet. Write the equation of the arch.
A. y = 
x2 + 114
B. y = - 
x2 + 114
C. y = -x2 + 114
D. y = x2 + 114
Mathematics