Solve the system of equations algebraically for real values of x and y.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: B
Mathematics
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Find the measure of the dihedral angle indicated.The figure shown is a right prism whose bases are regular nonagons. Find the measure of the dihedral angle between adjacent lateral faces.
A. 40° B. 140° C. 144° D. 90°
Mathematics
Provide an appropriate response.Simplify: 
A. 
B. 
C. 
D. 
Mathematics
Decide whether the statement is an example of the commutative, associative, identity, inverse, or distributive property.(8 ? 4) ? 1 = 8 ? (4 ? 1)
A. Identity B. Commutative C. Associative D. Distributive
Mathematics
Use synthetic division to find the function value.f(x) = 4x3 - 7x2 - 5x + 4; find f(2)
A. 66 B. 18 C. -36 D. -2
Mathematics