Atruck travels for 4 hours at an average speed of 42 miles per hour. how much longer must the truck travel at an average speed of 55 miles per hours so that the average speed for the total trip will be 50 miles per hour?

4 * 42 + 55 * x / ( 4 + x ) = 50.

The answer of x comes out to be 6.4. Which means that the truck will have to travel around 6.4 miles at an average speed of 55 miles to make it 50.

Well to understand how i constructed its equation is very simple. I equated the total average speeds answer to 50 and just calculated the average speeds with the help of algebra where x is the number of miles at 55 mph.

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

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step-by-step explanation: