Find the unknown diameter or radius as indicated.
A. 7 m
B. 14? m
C. 28 m
D. 7? m
Answer: A
Mathematics
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Use a calculator to decide whether the statement is true or false.cos (2 ? 90°) = cos2 90° - sin2 90°
A. True B. False
Mathematics
Classify the function as a polynomial function, rational function, or root function, and then find the domain. Write the domain in interval notation.f(x) = 
A. root function; (-?, 18]
B. root function; (-?, 3
]
C. root function; (-?, 18) ? (18, ?)
D. root function; (-?, 3
) ? (3
, ?)
Mathematics
Evaluate. Assume that all variables represent positive numbers. - 
A. - 
B. 16
C. 
D. -16
Mathematics
Factor the trinomial completely, or state that the trinomial is prime.-3x2 - 14x - 8
A. prime B. -(3x - 2)(x - 4) C. -(3x + 4)(x + 2) D. -(3x + 2)(x + 4)
Mathematics