Find the weighted mean of the numbers in the table. Round to the nearest tenth.Five rats were inoculated against a disease. After an incubation period, the number of rats contracting the disease was noted. The experiment was repeated 20 times, with the results shown in the table. 
A. 2.4 rats
B. 2.7 rats
C. 2.3 rats
D. 3.1 rats
Answer: C
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Use Newton's Law of Cooling to solve the problem.A cup of coffee with temperature 102°F is placed in a freezer with temperature 0°F. After 5 minutes, the temperature of the coffee is 67.4°F. When will its temperature be 29°F? Round your answer to the nearest minute.
A. 21 minutes after being placed in the freezer B. 24 minutes after being placed in the freezer C. 14 minutes after being placed in the freezer D. 15 minutes after being placed in the freezer
Establish the identity.cos
= 
cos x - 
sin x
What will be an ideal response?
Find the value of the missing number.
= -2
A. -8 B. 6 C. -6 D. 8
List all numbers from the set that are of the type indicated.
Whole numbers
A. 
, 
, 
B. 
, 
C. 
, 
, 
, 
D. 
, 
, 
, 