Solve the proportion.
= 
A. 126
B. 28
C. 14
D. 252
Answer: B
Mathematics
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Solve by the substitution method.-5x + 8y = -462x + 3y = -25
A. {(-2, -6)} B. {(-2, -7)} C. {(-3, -6)} D. ?
Mathematics
Find the exact value under the given conditions.sin ? = 
, 
< ? < ?; cos ? = 
, 0 < ? < 
Find sin (? - ?).
A. - 
B. 
C. 
D. 
Mathematics
Determine the approximate area of the given circle, using 3.14 for ?. Round the answer to the nearest hundredth.
A. 157 cm2 B. 1962.5 cm2 C. 490.63 cm2 D. 78.5 cm2
Mathematics
Find the exact value of the trigonometric expression without the use of a calculator.If sin ? = 
, 
< ? < ? and cos ? = 
, 0 < ? < 
, find the exact value of cos (? - ?).
A. 
B. 
C. 
D. 
Mathematics