Math study skills. Introduction to statistics. Pre-algebra topics. Solving linear and multivariable equations. Graphing linear equations and inequalities. Ratio, rate, and proportion. Real number system, properties, and order of operations. Area and perimeter of rectangles, areas, and circles. Algebraic problem solving. Exponents and radicals. Factoring polynomials, algebra of rational expressions, solving equations by factoring. Credits not applicable toward graduation. Graded CR/NC. After successful completion of 091, students continuing on to 111 or 112 are required to take 081 as a co-requisite and students continuing on to 130 are required to take 083 as a co-requisite.