Find the coordinates of the vertex of the quadratic function.f(x) = -7(x - 5)2 - 9
A. (-9, 5)
B. (-7, -5)
C. (5, -9)
D. (-5, -9)
Answer: C
Mathematics
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Solve the problem. Round to the nearest hundredth, if necessary.The monthly incomes of trainees at a local mill are normally distributed with a mean of $1100 and a standard deviation $150. What percentage of trainees earn less than $900 a month?
A. 90.82% B. 40.82% C. 35.31% D. 9.18%
Mathematics
Write an equation of the line.
A. y = - 
x
B. y = 
x
C. y = 
x
D. y = - 
x
Mathematics
Add or subtract.4 + (-3)
A. -7 B. 7 C. 1 D. -1
Mathematics
Solve the equation and check the solution.-8.8 + 3x - 6.9 + 4x - 2.8 = 5.6 + 8x + 1.4
A. x = -11.5 B. x = 25.5 C. x = 11.5 D. x = -25.5
Mathematics