**Step-by-step explanation:**

45% of number = 180

=> 100% of number = 180 * (100/45) = 400.

Hence the number is 400.

**Answer: 4**

**Step-by-step explanation:**

Exterior angle c = the sun of the two opposite interior angles a and b.

10x -23 = 5x -17 + 7x -26

Combine the right side:

10x -23 = 12x -43

Add 43 to both sides:

10x +20 = 12x

Subtract 10x from both sides:

20 = 2x

Divide both sides by 2

X = 10

Now you have x replace it in the equation for A:

A = 5x -27 = 5(10) -27 = 50-27 = 23

Angle A = 23 degrees.

Hello!

Angle A has the same one line mark as angle Z. This makes them congruent. The same with B and X, but with a two line mark. This means C is congruent to Y.

This means our answer is D.

I hope this helps!