Evaluate the expression.
1/2
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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For the given probability density function, over the stated interval, find the requested value.f(x) = 
x over [0, 2
]; Find the median.
A. 
B. 
C. 2
D. 
Mathematics
Solve the problem.A heat engine is a device that converts thermal energy into other forms. The thermal efficiency, e, of a heat engine is defined by 
where Qh is the heat absorbed in one cycle and Qc, the heat released into a reservoir in one cycle, is a constant. Find 
.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics
Find the exact value under the given conditions.sin ? = 
, 0 < ? < 
; cos ? = 
, 0 < ? < 
Find cos (? + ?).
A. 
B. 
C. 
D. 
Mathematics
Write the number in expanded form.90,780
A. 90,000 + 700 + 80 B. 9000 + 70 + 8 C. 90,000 + 7000 + 80 D. 9000 + 700 + 8
Mathematics