**Answer:**

Because of tax.

**Step-by-step explanation:**

**Answer:**

x=31°

**Step-by-step explanation:**

98°+51°+x°=180° (sum of angles in a triangle is 180°)

149°+x°=180°

MAKE x° THE SUBJECT OF FORMULA

x°=180-149

x=31°

**Answer:**

10 cm

**Step-by-step explanation**

to fine area of square you multiply 2 sides together and get the area and 10x10 is 100

**Answer:**

Option C.

**Step-by-step explanation:**

** **(the two angles sum to the angle of a straight line: )

(sum of interior angles of triangle is )

∴ Option C is correct.

Hope this helps :)