Simplify the expression. All variables represent positive real numbers.
A. 8x2
B. -4x2
C. 16x2
D. not a real number
Answer: B
Mathematics
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Find the axis of symmetry of the given function.f(x) = -x2 + 15x - 1
A. x = 
B. x = 15
C. x = 
D. x = - 
Mathematics
Write the phrase as a mathematical expression. Use x to represent the number. Combine like terms if possible.A number multiplied by 4, added to -8, subtracted from 8 times the sum of 2 times the number 
A. 4(-8 + x) + 8(2x + 9); 20x - 23 B. 4x - 8 + 8(2 + 9x); 76x + 20 C. 4(-8 + x) + 8(2 + 9x); 13x - 16 D. 8(2x + 9) - [4x + (-8)]; 12x + 80
Mathematics
Add or subtract as indicated.
- 
A. 
B. 
C. 
D. 
Mathematics
Solve.
- 1 = 
A. {-8, 10} B. {-20, 10} C. {8, -10} D. ?
Mathematics