Question

Four friends agree to save money for a graduation road trip they decided that each of them will put $.25 in the phone on the first day of Maine $.50 on the second day and $.75 on the third day and salon at the end of May there will be blank in

Answer 1

496

Explanation:

Answer 2

At the end of May, the friends will have $496 with them.

Explanation:

This question is based on arithmetic sequence.

Here a1 =
`0.25*4=1`

a2 =
`0.50*4=2`

a3 =
`0.75*4=3`

So,
`d=2-1=1`

(a1=1, a2=2, a3=3, a4=4........)

The sum of the arithmetic sequence:

`S=n/2 (a1+an)`

`an=a1+(n-1)d`

=>
`an=1+(31-1)1`

=> an=31

Now putting the value of an in the sum formula:

`S=31/2(1+31)`

`S=15.5*32=496` dollars

So, at the end of May, they will have $496 with them.