An oil change at city auto is regularly $30 Mr. Allen has a coupon for 15% off.

Which equation can be used to find the sale price, S, of an oil change?

1. s=0.85 divided by 30

2. s=85 divided by 30

3. s=0.85(30)

4. s=85•30

3. 0.85(30)

Step-by-step explanation:

If he had 15% off, then 85% would be left.

100% - 15% = 85%

0.85(30)

25.50

The sale price is 20 and the answer is 3. s=0.85(30)

34

step-by-step explanation:

answer:   the paragraph proof is mentioned below.

step-by-step explanation:

given: in a δxwy where

such that, ∠wzx ≅ ∠yzx and zw≅zy

we have to prove that: segment zx is a perpendicular bisector of segment wy.

prove: since, zw≅zy ⇒ ∠wzy is a supplementary angle.

then, ∠wzy= 180°

⇒∠wzx + ∠yzx = 180° ( because xz divides ∠wzy into two parts)

but, ∠wzx ≅ ∠yzx ( given)

⇒∠wzy+∠wzy=180° ( by substitution)

⇒2∠wzy=180°

⇒∠wzy=90°

⇒∠wzy=∠yzx =90°

therefore, xz⊥wy where wz=zy

⇒zx is a perpendicular bisector of wy.