Casandra is training for the 10 mile race. on the first day of training she runs 4 miles, each day after that she adds on 0.5 mile. on what day will casandra run 8 miles?

Casandra will run 8 miles on the 9th Day.

Step-by-step explanation:

Given:

Casandra on first day of training  she runs 4 miles

So we can say that;

Also Given:

each day after that she adds on 0.5 mile.

So we can say that;

Common difference

We need to find on what day she will run 8 miles.

So we can say that;

Let the number of the day be denoted by 'n'

Solution:

Now By using the formula of Arithmetic Progression we get;

Now substituting the values we get;

Now by using distributive property we get;

Now subtracting both side by 3.5 we get;

Dividing both side by 0.5 we get;

Hence Casandra will run 8 miles on the 9th Day.

according to egenuity the answer is

step-by-step explanation:

d. 344.22

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