21. Match the equations to the center and radius of the circle each represents. Show your
work
A. *2 + y2 + 18x + 22y – 23 = 0
B. x + y - 18x + 22y + 33 = 0
C. 25x' + 25y2 - 450x - 550y - 575 = 0
D. 25x + 25y2 + 450x - 550y + 825 = 0
C(9, -11); r= 13
C(9, 11); r= 15
C(-9, -11); r= 15
C(-9, 11);r= 13
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Acompany manufactures large valves, packed in boxes. a shipment consists of 1500 valves packed in 75 boxes. each box has the outer dimensions 1.2 x 0.8 x 1.6 m and the inner dimensions 1.19 x 0.79 x 1.59 m. the boxes are loaded on a vehicle (truck + trailer). the available capacity in the vehicle combination is 140 m3. each valve has a volume of 0.06 m3. - calculate the load factor on the box level (%). - calculate the load factor on the vehicle level (%). - calculate the overall load factor (%).

In the geometric progression –3, 12, −48… what term is 3,072?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.