Determine the exact value of the expression without the use of a calculator.cos 75?+ cos 15?
A. 
B. 
C. - 
D. - 
Answer: A
Mathematics
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Sketch a typical level surface for the function.f(x, y, z) = cos (x2 + y2 + z2)
A. 
B. 
C. 
D. 
Mathematics
Provide an appropriate response.Which is the least common multiple of 4 and 15?
A. 60 B. 30 C. 15 D. 4
Mathematics
Identify the coefficient of each term.z
A. -1 B. 1 C. z D. 0
Mathematics
Solve the problem.The expression 0.60(220 - a - r) + r is used to obtain the target heart rate for a cardiovascular workout for a nonathletic male with age a and resting heart rate r. The accompanying table shows the target heart rate for a 23-year-old nonathletic female for various resting heart rates. Find the missing entries. 
A. 144.2; 146.2; 148.2 B. 147.8; 149.8; 151.8 C. 135.2; 137.2; 139.2 D. 222.2; 230.2; 238.2
Mathematics