A metal bar is heated and then placed on a workbench for bending. The temperature B, in degrees Fahrenheit, t minutes after heat is applied is given by
.
?
The bar can be worked so long as its temperature is higher than 440 degrees. For what values of t is the bar suitable for working? Round your answer to two decimal places.
?
A. 
minutes
B. 
minutes
C. 
minutes
D. 
minutes
Answer: B
Mathematics
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Solve the initial value problem and leave the solution in implicit form.y'(x)
= 
, y(20) = 1
A. 
(y + 8)3/2 = 
(x - 4)3/2 - 37
B. (y + 8)3/2 = (x - 4)3/2 + 7
C. 
= 
- 1
D. (y + 8)3/2 = (x - 4)3/2 - 37
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Perform the indicated operations. Write the result using only positive exponents. Assume all variables represent nonzero real numbers.
A. 
B. 
C. 
D. 
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Replace the ? with the symbol <, >, or =.-332 ? -14
A. < B. = C. >
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Solve.On a map, 1 in. represents 120 miles. How much does 
in. represent?
A. 72 mi B. 62 mi C. 200 mi D. 82 mi
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