Suppose z denotes the set of all integers, z denotes the set of all positive integers, and z− denotes the set of all negative integers. similarly r denotes the set of all real numbers, r denotes the set of all positive real numbers, and r− denotes the set of all negative real numbers. suppose n denotes the set of all natural numbers and q denotes the set of all rational numbers. enter "t" for each true, and "f" for each false statements.(a) z / q = z(b) z / z- = n

The answer is 41.7 because 1.39 times 30 is 41.7

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 )