Source: INEP – proof and template of the 2nd day, Notebook 5 – Yellow (1st application). The ENEM Mathematics and Technologies test 2021 was administered on the 2nd day and will from question 136 to 180. This post addresses questions 136 to 150. The numbering used here is that of the Notebook 5 – Yellow; us In other notebooks the same questions appear in a different order. Template Question Subject Template 136 Roman numeral system D 137 Addition in binary base D 138 Area and subdivision units C 139 Combinatorial analysis: combinations A 140 Cost per user (comparison) B 141 Percentage: heart rate D 142 Fewer number of washes (inequality) C 143 Discounts: lower expense C 144 Spatial geometry: faces of the structure A 145 Octahedron flattening E 146 Perimeter of equilateral triangle D 147 Volume of the cone frustum C 148 Areas of flat figures and cost E 149 Dimensional analysis B 150 Linear system: baggage mass B Question 136: Year of foundation in Roman numerals Statement The Roman numeral system is still used to indicate chapters and volumes of books, in the designation of centuries and, in chronological order, of popes and kings of the same name. Seven letters of the alphabet are used: