Multiply. Write the result in the form a + bi.(3 + i
)(3 - i
)
A. 13
B. 5
C. 25
D. 9 + 4i
Answer: A
You might also like to view...
Divide and round the answer to the indicated place.
; to the nearest hundredth
A. 0.23 B. 2.27 C. 2.77 D. 0.28
Divide. Express the quotient in lowest terms.
÷ 
A. 
B. 
C. - 
D. 
Solve the problem.Newton's Law of Cooling states that the rate of change of temperature of an object is proportional to the difference in temperature between the object and the surrounding medium. Thus, if T is the temperature of the object after t hours and T0 is the (constant) temperature of the surrounding medium, then
where k is a constant. A cup of coffee with a temperature of 102°F is placed in a freezer with a temperature of 0°F. After 7 minutes, the temperature of the coffee is 57.5°F. When will its temperature be 41°F? Round your answer to the nearest minute.
A. 24 minutes after being placed in the freezer B. 21 minutes after being placed in the freezer C. 11 minutes after being placed in the freezer D. 14 minutes after being placed in the freezer
Solve the problem.How many months are there in 31 years?
A. 382 months B. 372 months C. 43 months D. 53 months