Figure ABCD is a parallelogram.
What are the lengths of line segments AB and BC?

O AB = 4; BC = 16
O AB = 4; BC = 8
O AB = 10; BC = 20
O AB = 10; BC = 28

AB = 10 units, and BC = 28 units

Step-by-step explanation:

Segments AB and DC are equal to each other, so we can set both equations equivalent to each other on opposite sides of an equation.

3y - 2 = y + 6

3y = y + 8

2y = 8

y = 4

Now we can plug in our y variable (4) into one of the segments equations; either AB's or DC's.

3y - 2

3(4) - 2

12 - 2

10

Segments AB and DC = 10

We can do the same thing with segments AD and BC.

2x - 4 = x + 12

2x = x +16

x = 16

Now we can plug in out x variable (16) into one of the segments equations; either AD's or BC's.

2x - 4

2(16) - 4

32 - 4

28

Thus, both segments AD and BC are 28 units long.

Our answer would be AB = 10 units, and BC = 28 units.

large crystals result from very slow cooling.

evaporation of water: this would produce an evaporite which is a sedimentary rock. like a salt pan in a desert. not possible to have volcanic rocks originate this way.

crystalization in molten earth: slow cooling over time. (hundreds to millions of years)

crystalization at earth's surface: this results in fast cooling. (a few hours to a few months or years)

crystalization from cooling off hot water: that would be a hydrothermal deposit. while associated with volcanics they are not volcanic rocks themselves and usually occur fairly rapidly.