Use identities to find the indicated value for each angle measure.cos ? = 
, sin ? < 0
Find sin(2?).
A. 
B. 
C. - 
D. - 
Answer: C
Mathematics
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Write the decimal as a percent. 0.9
A. 900% B. 90% C. 0.09% D. 0.9%
Mathematics
Find the magnitude of the vector.u = 
A. 
B. 
C. 5
D. 
Mathematics
Solve the problem by using a nonlinear system.In 1975, 
and 
had the same population. The population of 
continued to increase steadily, while the rate of population growth of 
(although initially less than that of 
) eventually
overtook the growth rate of City #2. The populations of two cities are modeled by the following equations: 
: 
; 
: 
, where 
corresponds to the year 1975. In what year after 1975 did the cities have the same population?
A. 1978
B. 1980
C. 1979
D. 1981
Mathematics
Simplify the expression. Assume that all variables are positive when they appear.-
A. 5x8y4 B. 5x8y6 C. 25x8y4 D. -5x24y4
Mathematics