Suatu set nombor 5, 12, x, 2x, 10 dan 18 mempunyai min h . Apabila setiap nombor itu ditambah dengan 3, min menjadi 6 per 5 h . Cari nilai x

In a parallelogram the two angles on the same side need to equal 180 degrees. So in the picture angle F and angle G need to equal 180:

Add them together:

7x -5 + 3x-15 = 180

Simplify by combining like terms:

10x -20 = 180

Add 20 to both sides:

10x = 200

Divide both sides by 10:

X = 20

Now you know x, replace x in the angle for g and solve:

G= 7x-5 = 7(20) -5 = 140-5 = 135

G = 135 degrees.

In a parallelogram the top and bottom are the same length, so set the two to equal each other and solve for y:

3y = y + 8

Subtract y from both sides:

2y = 8

Divide both sides by 2:

Y = 4

Now replace y and solve for EF:

EF = 3y = 3(4) = 12

EF = 12