Factor out the greatest common factor.x8y5 - x8y4 + x6y2 - x5y2
A. x5y2(x2y3 - x2y2 + xy - 1)
B. x4y2(x3y3 + x3y2 + x + 1)
C. x5y2(x3y3 - x2y2 + x - 1)
D. x5y2(x3y3 - x3y2 + x - 1)
Answer: D
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Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where c is cost and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 20 watches B. 36 watches C. 73 watches D. 39 watches
Solve using the addition and multiplication principles together.3(2z - 4) = 5(z + 2)
A. 1 B. 2 C. -2 D. 22
Solve the problem.An isosceles triangular plate is submerged vertically in seawater, with its base on the bottom. The base is 
long, and the height of the triangle is 
. Find the force exerted on one face of the plate if the water level is 
above the base of the triangle. Seawater weighs 
Round your answer to one decimal place if
necessary. A. 1792 lb B. 341.3 lb C. 3584 lb D. 1194.7 lb
In the figure below, Z = 70 ê and XC = 25 ê. Find R.
a. 26.77 ê
b. 23.53 ê
c. 46.52 ê
d. 51.91 ê
e. 65.38 ê