Establish the identity.sin 
= cos x
What will be an ideal response?
sin 
= sin x cos 
+ sin 
cos x = (sin x)(0) + (1)(cos x) = cos x.
Mathematics
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Solve the problem.Which of the following vectors is parallel to v = 9i + 5j?
A. w = 
i - 
j
B. w = 
i + 
j
C. w = 45i - 25j
D. w = - 
i + 
j
Mathematics
Solve the equation.
= 1 - 
A. {0, -5} B. {0, 7} C. {1, 5} D. ?
Mathematics
Water whose temperature is at 100 oC is left to cool in a room where the temperature is 30 oC. After 2 minutes, the water temperature is 88 oC. If the water temperature T is a function of time t given by
, find k. Round your answer to the nearest hundredth.
?
A. 
B. ?
C. ?
D. ?
E. none of these
Mathematics
Write the word statement in symbols.Ten is less than or equal to five plus six.
A. 5 + 6 ? 10 B. 10 < 5 + 6 C. 10 ? 5 + 6 D. 10 + 5 ? 6
Mathematics