Use negative exponents where necessary to write the expression with all variables in the numerator of a term. That is, write each term in the form cxn if the term contains a variable.y = 6x - 4 + 
- 
+ 
A. y = 6x - 4 + (8x)-4 - x-1/2 + (1x)-2/3
B. y = 6x - 4 + 8x-4 - x-2 + 1x-3/2
C. y = 6x - 12 + x-4 - x-1/2 + x-2/3
D. y = 6x - 4 + 8x-4 - x-1/2 + 1x-2/3
Answer: D
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Find the limit, if it exists.
A. Does not exist
B. - 
C. - 
D. 0
Find an equation of variation for the given situation.y varies jointly as x and z, and y = 91 when x = 5.2 and z = 7
A. y = 5.5xz
B. y = 0.25xz
C. y = 
D. y = 2.5xz
Find the product using the FOIL method.(5x - 7)(x + 5)
A. 5x2 + 16x - 35 B. 5x2 - 35x + 18 C. 5x2 + 18x + 18 D. 5x2 + 18x - 35
Due to a lightening strike, a forest fire begins to burn and is spreading outward in a shape that is roughly circular. The radius of the circle is modeled by the function r(t) = 3t, where t is the time in minutes and r is measured in meters. Write a function for the area burned by the fire directly as a function of t.
A) (A ? r)(t) = 3?t² C) (A ? r)(t) = 6?t B) (A ? r)(t) = 9?t² D) (A ? r)(t) = 3?2t²