Mr. Yee, a professor at a local university, decides to use observation. He rides in the car with 20 city residents. He notes if he sees the driver texting while driving (a) Provide an advantage of using observation. (b) Provide a disadvantage of using observation. (c) What are the sample and population for Mr. Yee’s research? (d) Suppose 3 of the 20 drivers texted during the observation. What conclusion might Mr. Yee make about the percent of people in the city who text while driving?

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 )

2x+10=36. x being the number of friends.