Which of the following questions represents this equation? m + 13 = 21 what number when increased by 21 is equal to 13? what number when subtracted from 13 is equal to 21? the sum of what number and 13 is equal to 21? what number when multiplied by 13 is equal to 21?

C. The sum of what number and 13 is equal to 21

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )