MA.912.AR.1.2 Rearrange equations or formulas to isolate a quantity of interest. MA.912.AR.1.1 Identify and interpret parts of an equation or expression that represent a quantity in terms of a mathematical or real-world context, including viewing one or more of its parts as a single entity. MA.912.AR.1 Interpret and rewrite algebraic expressions and equations in equivalent forms. 
MA.912.NSO.1.4 Apply previous understanding of operations with rational numbers to add, subtract, multiply and divide numerical radicals. MA.912.NSO.1.2 Generate equivalent monomial algebraic expressions using the properties of exponents. Apply the Laws of Exponents to evaluate numerical expressions and generate equivalent numerical expressions involving rational exponents. MA.912.NSO.1.1 Extend previous understanding of the Laws of Exponents to include rational exponents. MA.912.NSO.1 Generate equivalent expressions and perform operations with expressions involving exponents, radicals or logarithms. Post is closed for comments.Get it now NSO Number Sense and Operations (If you are not homeschooling, check with your students teacher! They will know if your school is set up to follow an Integrated curriculum or a Traditional structure.) It's not the easiest to navigate, but the lessons are well-designed: This is an Algebra 1 sequence which follows the freely-available curriculum from New York State Education Department. 
If you are homeschooling your 9th grader (and don't already have a curriculum), I'll actually recommend Khan's EngageNY collection. In practice, (and in Khan's structure), you often get a block of Algebra followed by a block of Geometry. In a perfect world, this mixing would be done at the activity-level: you'd have questions about algebraic expressions which relate to geometric objects, or your simple quadratic functions would be tied to questions about a circle's area. Mathematics 1 is an "integrated" course mixing both algebraic and geometric topics. Algebra 1 is a "traditional" course covering linear equations, algebraic expressions, and some simple functions.
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