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# Tutor profile: Kaitlyn R.

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Kaitlyn R.
Elementary school teacher in California for three years
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## Questions

### Subject:Writing

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Question:

When is it appropriate to use commas in compound sentences?

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Kaitlyn R.

Generally, commas are always used when separating two independent clauses. The comma precedes a coordinating conjunction and goes after the first independent clause. For example, a comma is necessary in the following sentence: Today I went to the grocery store, and then I came home and made dinner. A comma is not necessary in the following sentence: Today I went to the grocery store and then made dinner.

### Subject:Pre-Algebra

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Question:

A bag contains green and yellow marbles. Given that 17/20 of the marbles are green, what percent of the marbles are yellow?

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Kaitlyn R.

There are two strategies one might use to find the solution to this question. First, you might find the fraction of marbles that are blue (subtract 17/20 from 20/20 or one whole) and then convert this fraction to a percentage. Alternatively, you could convert 17/20 green marbles to a percentage (by multiplying by a "version of one" - 5/5 in this case - to make your fraction's denominator 100 and therefore a percentage), and then subtract this percentage of green marbles from the total 100% to find the remaining percentage of yellow marbles. 20/20 - 17/20 = 3/20 3/20 * 5/5 = 15/100 or 15% of the marbles are yellow or 17/20 * 5/5 = 85/100 or 85% 100% - 85% = 15% of the marbles are yellow

### Subject:Basic Math

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Question:

There are 149 people attending a dinner party. If each table can seat 7 people, how many tables are needed for the dinner party?

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Kaitlyn R.

If 149 people need to be seated, and each table can seat 7 people, the following steps need to be taken to find the solution: First, divide 149 by 7 using either: 1- the long division algorithm (aligning place values and solving step by step), or 2- by taking groups of your divisor out of your dividend until you are left with a quotient and remainder (10 groups of 7 is 70, another 10 groups of 70 is 140, another group of 7 makes 147, with 2 left over -- equaling a total of 21 groups with a remainder of 2). Second, use context to interpret the remainder. Since there will be 2 people left without a place to sit, an additional table is required making our solution 22 tables.

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