Lesson 3

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 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.

Add.

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.

\(g + 0.05\)

\(g + 0.05g\)

\(1.05g\)

\(0.05g\)

\((1+0.05)g\)

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