Use Newton's Law of Cooling, T = C + (T0 - C)ekt, to solve the problemA casserole baked at 350°F is taken out of the oven into a kitchen that is 72°F. After 5 minutes, the temperature of the casserole is 312.5°F. After how many minutes will its temperature be 228°F? Round your answer to the nearest minute.
A. 24 min
B. 12 min
C. 21 min
D. 20 min
Answer: D
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Evaluate the given expression.tan[cos-1 (-0.5)]
A. - 
B. 
C. 
D. - 
Determine whether the pair of fractions is equivalent.
and 
A. equivalent B. not equivalent
Solve the problem.A bookcase is to be constructed as shown in the figure below. The height of the bookcase is 2 feet longer than the length of a shelf. If 22 feet of lumber is used for the entire unit (including the shelves, but NOT the back of the bookcase), find the length and height of the unit.
A. Length = 10.0 ft; height = 13.5 ft B. Length = 3 ft; height = 6 ft C. Length = 4.5 ft; height = 6.5 ft D. Length = 3 ft; height = 5 ft
Determine if each statement is true if
(i) PQRS is a rectangle
(ii) PQRS is a square
In each case, if true, explain why.
(a) PR ? SQ
(b) ?STP ? ?QTR
(c) ?STP = 90°
(d) ?QPT ? ?SRT