Solve the system of equations 3y + 2z = 12 and y – z = 9.
A. y = 6, z = 15
B. y = –6, z = 15
C. y = 6, z = –3
D. y = 24, z = 15

3y + 2z = 12 y – z = 9 y = z + 9 3(z + 9) + 2z = 12 3z + 27 + 2z = 12 5z + 27 = 12 5z = 12 - 27 5z = -15 z = -15/5 z = -3 y - (-3) = 9 y + 3 = 9 y = 9 - 3 y = 6 Solution set: y = 6, z = -3

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Asked 12/11/2017 1:15:22 PM

Updated 12/12/2017 1:53:18 AM

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3y + 2z = 12

y – z = 9

y = z + 9

3(z + 9) + 2z = 12

3z + 27 + 2z = 12

5z + 27 = 12

5z = 12 - 27

5z = -15

z = -15/5

z = -3

y - (-3) = 9

y + 3 = 9

y = 9 - 3

y = 6

Solution set: y = 6, z = -3

y – z = 9

y = z + 9

3(z + 9) + 2z = 12

3z + 27 + 2z = 12

5z + 27 = 12

5z = 12 - 27

5z = -15

z = -15/5

z = -3

y - (-3) = 9

y + 3 = 9

y = 9 - 3

y = 6

Solution set: y = 6, z = -3

Added 12/12/2017 1:53:18 AM

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A cylindrical tank has a radius of 15 feet and a height of 45 feet. How many cubic feet of water can the tank hold?
A. 675 cu. ft.
B. 127,170 cu. ft.
C. 15,896.25 cu. ft.
D. 31,792.5 cu. ft.

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Updated 6/24/2019 1:09:52 AM

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[Deleted]

Added 6/24/2019 1:09:41 AM

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Deleted by maydj [6/24/2019 1:09:46 AM]

A cylindrical tank has a radius of 15 feet and a height of 45 feet. Volume of cylinder = pi *r^2*h , volume =3.14*15^2*45 , volume = 31,792.5 cu. ft.

Added 6/24/2019 1:09:52 AM

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What's the area of a square computer screen with 21-inch sides?
A. 220 sq. in.
B. 42 sq. in.
C. 441 sq. in.
D. 84 sq. in.

Question

Updated 7/7/2019 2:12:17 AM

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[Deleted]

Added 7/7/2019 2:12:08 AM

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Deleted by maydj [7/7/2019 2:12:10 AM]

The area of a square computer screen with 21-inch sides is 441 sq. in.

A = a² = 21² = 21 * 21 = 441

A = a² = 21² = 21 * 21 = 441

Added 7/7/2019 2:12:17 AM

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Find the circumference of a circle if the area is 300 square centimeters.
A. 9.77 cm
B. 56.25 cm
C. 61.38 cm
D. 84.74 cm

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Updated 7/7/2019 2:12:48 AM

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The circumference of a circle if the area is 300 square centimeters.

Area = pi*r^2 = 3.14*r^2 , area = 300 , r^2 = 300/3.14 = 95.5414 , r = 9.77cm , circumference =2 *pi*r =2*3.14*9.77 = 61.38 cm.

Area = pi*r^2 = 3.14*r^2 , area = 300 , r^2 = 300/3.14 = 95.5414 , r = 9.77cm , circumference =2 *pi*r =2*3.14*9.77 = 61.38 cm.

Added 7/7/2019 2:12:48 AM

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Why did the Portuguese trading empire fall apart by 1500?
A. Spain conquered Portugal.
B. England conquered Portugal.
C. Portugal was a small country with few resources.
D. Portugal suffered through a civil war.

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Updated 12/5/2017 1:35:08 PM

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The Portuguese trading empire fell apart by 1500 because Spain conquered Portugal.

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Which of the following was an advantage held by imperialist powers over native peoples in the 1800s?
A. Alliances among well-developed nations
B. Better raw materials
C. Native people rejecting self-rule
D. Better transportation

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Updated 3/7/2020 2:30:06 PM

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Better transportation was an advantage held by imperialist powers over native peoples in the 1800s.

Added 3/7/2020 2:30:06 PM

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