Write a numerical expression for the phrase and simplify it.The product of 3 and the difference between 9 and -1
A. (3 - 9)(-1); 6
B. (3)(9) - (-1); 28
C. 3[-1 - 9]; -30
D. 3[9 - (-1)]; 30
Answer: D
Mathematics
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Solve. Simplify the answer.Barat walked 
mile to his biology class, 
mile to his art class, 
mile to his calculus class, and then back to his dormitory. If he walked 1 mile altogether, how far did he walk from his calculus class to his dormitory?
A. 
mi
B. 
mi
C. 
mi
D. 
mi
Mathematics
Solve the problem.A plane flies 420 miles with the wind and 350 miles against the wind in the same length of time. If the speed of the wind is 22 mph, what is the speed of the plane in still air?
A. 232 mph B. 242 mph C. 247 mph D. 267 mph
Mathematics
Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 1
B. 
C. 
D. 
Mathematics
Find the real solutions of the equation.
= x + 4
A. {5} B. {9} C. {1} D. {-5}
Mathematics