Question

4 Divya has 70 rocks. She donates half of the rocks to a science center. Then she

collects 3 rocks on each of her nature hikes. Write an expression to represent the

number of rocks Divya has after she collects rocks on n nature hikes.

What is the answer pls pls pls

Answer 1

35 +
`3n`

Explanation:

Number of rocks present with Divya = 70

Half of the rocks are donated.

i.e.
`(70)/(2) =35` number of rocks are donated.

Now,

Number of rocks left with Divya = Number of rocks earlier present with Divya - Number of rocks donated

Number of rocks left with Divya = 70 - 35 = 35

Number of nature hikes =
`n`

For each nature hike, number of rocks collected = 3

Number of rocks collected from nature hikes = Number of nature hikes
`*` Number of rocks collected from each nature hike

Number of rocks collected from nature hikes =
`n`
`*` 3 =
`3n`

Expression to represent the number of rocks collected after collecting rocks from
`n` nature hikes can be found by adding number of rocks with Divya after donating half the rocks and number of rocks collected from nature hikes.

Therefore, the answer is:

35 +
`3n`