Shelly biked 21 miles in 4 hours. how long will it take shelly to bike 63 miles?

 The required time is 12 hours.

Step-by-step explanation:  Given that Shelly biked 21 miles in 4 hours.

We are to find the time taken by Shelly to bike 63 miles.

We will be using the UNITARY method to solve the problem.

We have

Time taken by Shelly to bike 21 miles = 4 hours.

So, time taken by Shelly to bike 1 mile will be

Therefore, time taken by Shelly to bike 63 miles is given by

Thus, the required time is 12 hours.

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: