# Tutor profile: Robin D.

## Questions

### Subject: Pre-Algebra

What is the area of a triangle with a base measuring 9 inches and a height of 6 inches? What is the are of a rectangle with the same base and height? How many triangles of this size will fit in a rectangle of this size?

The area of a triangle (A)= 0.5*base*height. Therefore, the area of this triangle is: A = 0.5 * 9 in * 6 in = 27 square inches. The are of a rectangle is A = base * height. For this rectangle: A = 9 in * 6 in = 54 square inches. To find the amount of our triangles which fit in our rectangles, we divide: Area of rectangle / Area of triangle = (54/27) = 2. Therefore, 2 of our triangles will fit inside one of our rectangles.

### Subject: Chemistry

Rate the following from most acidic to most basic: Pure water, Eggs, Lemon Juice, Sodium Hydroxide, Hydrogen Chloride, Baking Soda, Milk

pH is a measure of the amount of hydrogen in a substance. Substances with higher hydrogen concentrations are considered "acidic" and those with low hydrogen concentrations are called "basic" or "alkaline". pH ranges from 0 to 14, from acidic to basic. pH 7 is neutral and is not acidic or basic. From most acidic to most basic, the following are ranked. Hydrochloric acid (pH 0), Lemon juice (2.2), Milk (6.8), Pure Water (7), Egg (7.8), Baking Soda (8.3), Sodium Hydroxide (14)

### Subject: Algebra

If there are 12 eggs in a carton and a carton costs $1.99, how much is each egg worth? If you need 3 eggs for each batch of cookies, how much will it cost for the eggs to make 2 batches?

Since 12 eggs costs $1.92, we say that the cost of one egg (E) x 12 eggs = $1.99. Therefore, we can solve for E using the equation E = $1.92/12 = $0.16 or 16 cents. If we need 3 eggs for a batch of cookies and we are making 2 batches of cookies, we multiply 3 (eggs/batch) x 2 (batches) = 6 eggs needed. Then, we multiply 6 eggs x $0.16 (per egg) = $0.96. Therefore, the eggs for 2 batches of cookies cost 96 cents.

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