Lesson 3: Practice Problems

Problem 1

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?

Problem 2

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

charge from
electrons

charge from
protons

overall
charge

carbon

neon

oxide

copper

tin

Problem 3

Add.

Problem 4 From Unit 4 Lesson 8

Last week, the price, in dollars, of a gallon of gasoline was . 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.

Problem 5 From Unit 2 Lesson 7

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

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

    original price

    sale price