Leo is running in a 5-kilometer race along a straight path. if he is at the midpoint of the path, how many kilometers does he have left to run?

Let us assume Leo starts from a point (0,0)

Since the total length of the race is 5 km, he will be at (5,0) at the end of the race.

It is given that, he is at the mid point of the race.

Mid point formula is  :

Present coordinate :

He still needs to run 5-2.5 = 2.5 km

$238.33

Explanation:
Assume that the amount you need to save per month is x.

You will be saving monthly for 12 years. This means that the amount you will save after 12 years is:
amount saved after 12 years = 12 * 12 * x = 144x

Now, you need to save 20% of $171,600.00. We will first need to calculate this value.
20% of $171,600.00 = 0.2 * 171,600.00 = $34320

Now, to know your monthly savings, equate the total amount saved in 12 years with the amount that needs to be saved and solve for x as follows:
144x = 34320
x = 34320 / 144
x = 238.33

This means that, to meet your goal, you need to save $238.33 monthly for 12 years.

Hope this helps :)