Find the focus and directrix of the parabola.y = 9x2
A. 
, y = 
B. 
, x = - 
C. 
, x = - 
D. 
, y = - 
Answer: D
Mathematics
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Find the maximum rate of change of f(x,y) = xy² +?y at the point (2, 1). In what direction does it occur?
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Use the problem-solving strategy to solve the problem and find the unknown number.A number times 7 increased by 21 minus 5 times the number is the same as the product of 4 and the number, increased by 13.
A. 8 B. -4 C. -8 D. 4
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Find the area of the triangle below.
Mathematics
Use the power property to rewrite the expression.log2
A. 
log2
B. 8log2y
C. 
log2y
D. 
log8y
Mathematics