What is the final elevation if

1. A bird starts at 20 m and changes 16 m?

2. A butterfly starts at 20 m and changes -16 m?

3. A diver starts at 5 m and changes -16 m?

4. A whale starts at -9 m and changes 11 m?

5. A fish starts at -9 meters and changes -11 meters?

One of the particles in an atom is called an electron. It has a charge of -1. Another particle in an atom is a proton. It has a charge of +1.

The charge of an atom is the sum of the charges of the electrons and the protons. A carbon atom has an overall charge of 0, because it has 6 electrons and 6 protons and \(\text- 6 + 6 = 0\).

Find the overall charge for the rest of the elements on the list.

Find the value of each expression.

1. \(14.7 +28.9\)
2. \(\text-9.2 + 4.4\)
3. \(\text-81.4 + (\text-12)\)
4. \(51.8 + (\text-0.8)\)

Last week, the price, in dollars, of a gallon of gasoline was \(g\). This week, the price of gasoline per gallon increased by 5%. Which expressions represent this week’s price, in dollars, of a gallon of gasoline? Select all that apply.

Decide whether each table could represent a proportional relationship. If the relationship could be proportional, what would be the constant of proportionality?

1. Annie’s Attic is giving away $5-off coupons.

   original price	sale price
   \$15	\$10
   \$25	\$20
   \$35	\$30

2. Bettie’s Boutique is having a 20%-off sale.

   original price	sale price
   \$15	\$12
   \$25	\$20
   \$35	\$28

Match each written statement with a mathematical statement. All of these statements are true.