It is estimated that __________ % of the world’s technological advances have evolved in the last 100 years.
a -20%
b -50%
c -65%
d -80%
Answer: d -80%
Mathematics
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Graph the system of inequalities. Find the coordinates of the vertices.2y + x ? -2,y + 3x ? 9,y ? 0,x ? 0
A. 
(0 , -2) , (0, 9) , (4, -3)
B. 
(-2, 0) , (0, 9) , (0, 0)
C. 
(0 , -2) , (3, 0) , (4, -3)
D. 
(0, 0) , (0 , -1) , (3, 0) , (4, -3)
Mathematics
Solve.
= 
A. 1
B. 14
C. 2
D. 
Mathematics
The graph of f(x) = ax2 + bx + c is given in the figure. Determine whether the discriminant is positive, negative, or zero.
A. Negative B. Positive C. Zero
Mathematics
Factor completely.x2 + 30x + 225
A. (x + 15)(x - 15) B. (x + 15)2 C. (x + 225)(x + 1) D. (x - 15)2
Mathematics