math_celebrity Administrator Staff member Jul 18, 2020 #1 multiply a number by 4 and then subtract the answer from 30 The phrase a number means an arbitrary variable, let's call it x. x Multiply this number by 4: 4x Subtract the answer from 30: 30 - 4x

multiply a number by 4 and then subtract the answer from 30 The phrase a number means an arbitrary variable, let's call it x. x Multiply this number by 4: 4x Subtract the answer from 30: 30 - 4x