231 is 248 subtracted from the quantity h times 128 Let's take this algebraic expression in parts: h times 128: 128h 24 subtracted from this: 128h - 248 The word is means an equation, so we set 128h - 248 equal to 231 128h - 248 = 231 <-- This is our algebraic expression If the problem asks you to solve for h, then you type in this equation into our search engine and get: h = 3.742