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algebra learn to solve problems symbolically not just mentally/numerically variable expression collection of numbers, variables, operations ex 4m+6 5n p-2 x+3 25/y 3x evaluate expression replace each variable by a number and simplify the numerical expression note-simplify(expression) solve(equation) pg 3 examples evaluate when y=2 substitute 2 for y simplify (figure out) 8y 8(2) 16 Evaluate 10/y (sorry, don't know how to do bar) 10/2 5 Expressions containing exponents 4(exponent) 3(base) means 3x3x3x3=81 (don't actually use x while multiplying, don't know where raised dot is)