Maggie is training for the croos country meet. On the first day she runs 500m. Each day that she runs 250m more than the day before. At this rate Maggie thinks she can reach her goal of 5km in a single day on the 21stcday. Her sister says she will match the goal on the 19th day

Sister is correct.

Step-by-step explanation:

Given:

Starting distance a = 500 m

Extend ever day d = 250 m

Final distance = 5 km = 5,000 m

Find:

Number of days n

Computation:

An = a + (n-1)d

5,000 = 500 + (n-1)250

n = 19 days

Number of days n = 19 days

Sister is correct.

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

i will with my problems and all the other things that need to   be on by the way

step-by-step explanation: