Write the phrase as a mathematical expression. Use x to represent the number. Combine like terms if possible.A number multiplied by -4, subtracted from the sum of 19 and eight times the number.
A. 4x - 27
B. 4x - (19 + 8x); -4x - 19
C. (19 + 8x) - (-4)x; 19 + 12x
D. (19 + 8x) + (-4)x; 19 + 4x
Answer: C
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Find the center of mass of a thin plate of constant density covering the given region.The region bounded by the x-axis and the curve y = 7sin x, 0 ? x ? ?
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= ?, 
= 
D. 
= 
, 
= 
Add and simplify.
+ 
A. - 
B. - 
C. - 
D. - 
Solve. Remember to insert units when writing your answer.Four years ago, John planted a tree in his garden. It was 4 ft 5 in. tall. Since then the tree has grown 7 ft 11 in. How tall is the tree now?
A. 11 ft 16 in. B. 11 ft 4 in. C. 12 ft 6 in. D. 12 ft 4 in.
Solve the system of equations graphically, if a solution exists. 3x + 2y = 5-6x - 4y = 5
A. No solution
B. x = - 
, y = -1
C. x = 1, y = 1
D. x = 
, y = -1