Answer:
2) x = 7
4) x = 10
Explanation:
2)
Angles in a triangle add up to 180 degrees
This means that 70 + 60 + 6x + 8 = 180
70 + 60 + 6x + 8 = 180
==> combine like terms
138 + 6x = 180
==> subtract 138 from both sides
6x = 42
==> divide both sides by 6
x = 7
4) Again angles in a triangle add up to 180 degrees
Remember that a square indicates a right angle which has a measure of 90 degrees
This means that 51 + 90 + 3x + 9 = 180
51 + 90 + 3x + 9 = 180
==> combine like terms
150 + 3x = 180
==> subtract 150 from both sides
3x = 30
==> divide both sides by 3
x = 10