Find an equation of variation in which the following are true.y varies jointly as x and z, and y = 90 when x = 9 and z = 5
A. y = 10x
B. y = 
C. y = 2xz
D. y = 4xz
Answer: C
Mathematics
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Determine whether the following statement is true or false.56 divides 7.
A. True B. False
Mathematics
Write the equation in standard form for an ellipse centered at (h, k). Identify the center and the vertices.2x2 + 5y2 - 12x + 70y + 253 = 0
A. C(-3, 7); V(-3 ± 
, 7); 
+ 
= 1
B. C(3, -7); V(3 ± 
, -7); 
+ 
= 1
C. C(3, -7); V(3 ± 
, -7); 
+ 
= 1
D. C(-3, 7); V(-3 ± 
, 7); 
+ 
= 1
Mathematics
Rationalize the denominator. Assume that all variables represent positive real numbers.
A. 11
B. 
C. 7
D. 
Mathematics
Find the focus and directrix of the parabola with the given equation.5x2 = -9y
A. Focus: 
, directrix: x = 
B. Focus: 
, directrix: y = 
C. Focus: 
, directrix: y = - 
D. Focus: 
, directrix: y = 
Mathematics