options: Solve systems of equations.

Represent and solve problems involving addition and subtraction.

Rewrite rational expressions.

Understand the relationship between zeros and factors of polynomials.

Solve problems involving the four operations, and identify and explain patterns in arithmetic.

Perform arithmetic operations on polynomials.

Work with addition and subtraction equations.

Represent and analyze quantitative relationships between dependent and independent variables.

Solve real-life and mathematical problems using numerical and algebraic expressions and equations.

Use polynomial identities to solve problems.

Write expressions in equivalent forms to solve problems.

Work with equal groups of objects to gain foundations for multiplication.

Work with radicals and integer exponents.

Understand and apply properties of operations and the relationship between addition and subtraction.

Add and subtract within 20.

Create equations that describe numbers or relationships

Represent and solve problems involving multiplication and division.

Interpret the structure of expressions.

Apply and extend previous understandings of arithmetic to algebraic expressions.

Multiply and divide within 100.

Solve equations and inequalities in one variable.

Represent and solve equations and inequalities graphically.

Write and interpret numerical expressions.

Analyze patterns and relationships.

Use properties of operations to generate equivalent expressions.

Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.

Analyze and solve linear equations and pairs of simultaneous linear equations.

Generate and analyze patterns.

Understand solving equations as a process of reasoning and explain the reasoning.

Understand properties of multiplication and the relationship between multiplication and division.

Understand the connections between proportional relationships, lines, and linear equations.

Reason about and solve one-variable equations and inequalities.

Use the four operations with whole numbers to solve problems.

Gain familiarity with factors and multiples.
problem_activity: Potassium-40 has a half-life of
$${1.28\times 10^9}$$
years, which means that after that many years, half of a sample has decayed into a different isotope of carbon. If a sample began with
$${115}$$
grams of potassium-40
$${30,000,000}$$
years ago, how much is left today? How long will it be until there are only
$${50}$$
grams remaining?


correct_option_index: 17