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gg68814
02.11.2019 •
Mathematics
Acylinderical chemical drum is 220.5 cm long and the radius of the drum is 42 cm. calculate the cost of painting the drum akt the rate of rs. 0.15/cm
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Ответ:
The surface area of the cylindrical drum of radius 21cm, height 50cm open at the top.
radius R = 42 cm
length L = 220.5 cm
bottom surface SB = 3.14 x R x R = 3.14 x 42 x 42 = 5539 square cm
top surface ST = 3.14 x R x R = 3.14 x 42 x 42 = 5539 square cm
bottom circumference BS = 3.14 x 2 x R = 3.14 x 2 x 42 = 264 cm
wall surface area WS = BS x L = 264 x 220.5 = 58212 square cm
whole outside surface area SB + ST + WS = 5539 + 5539 + 58212 = 69290 square cm
whole inside and outside surface area 69290 + 69290 = 138,590 square cm
the cost of painting the drum's inside and outside walls Rs. 0.15 x 138,590 = Rs20787
Ответ:
The answer to your question is This system of equations can not be solved. They do not cross.
Step-by-step explanation:
2x - 6y = 5 (I)
x - 3y = -12 (II)
I.- Solve equation II for x
x = 3y - 12 (III)
2.- Substitute equation III on equation I
2(3y - 12) - 6y = 5
3.- Expand
6y - 24 - 6y = 5
6y - 6y = 5 + 24
0 = 29
This system of equations can not be solved.