Aused boat was purchased for $15,000 this year. each year the boat value decreases 11.5%.

current value - x(current value x 0.885)

Step-by-step explanation:

0:15,000 1:13,275 2:11,748.375

Step-by-step explanation: .885 times the original price (15000) because 11.5% minus 100% equals 88.5%. Just do this for each new one and you can get any answer for however many years after you need.

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.