Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 1
B. 
C. 
D. 
Answer: C
Mathematics
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Use the following definitions to determine if the statement is true or false. N = {x : x is a natural number}I = {x : x is an integer}R = {x : x is a real number}W = {x : x is a whole number}Q = {x : x is a rational number}Q is a proper subset of N, I, and W.
A. True B. False
Mathematics
Match the system of equations with one of the graphs.49x2 + 16y2 = 784x + y = 3
A. 
B. 
C. 
D. 
Mathematics
Make an approximate conversion as indicated. Round to the nearest tenth. The precise value of your approximation will depend on the conversion path that you choose.2.3 m = 
in.
A. 5.8 in. B. 2.5 in. C. 82.8 in. D. 90.6 in.
Mathematics
Evaluate.80 + (-12)0
A. 0 B. 2 C. -4 D. 1
Mathematics