Gabe went ot lunch with his best friend the bill costs 16.40 dollers before trax and tip he paid a 9 persent tax and left a 20 persent tip howm much did gabe spend

Step-by-step explanation:

Gabe went out for lunch with his best friend the bill costs $16.40

This amount was before tax and the tip that he wanted to give.

He paid a 9 percent tax on the bill. The amount of the 9 percent tax is 9/100 × 16.40 = 0.09 × 16.40 = $1.476

He left a 20 percent tip. This means that amount left as tip is 20/100 × 16.40 = 0.2×16.40 = $3.28

The amount that Gabe paid would be the sum of the bill, the tip and the amount paid on tax. It becomes

16.40 + 1.476 + 3.28 = $21.156

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc