Помогите прошу!!! надо вставить а/аn,the the park keeper found some litter in __ park.First he found __ crisp packet. __ packet was in __ middle of__ footbal pitch.then he found __ old comic. __ comic was under __ three hear __ lake.then he found some orange peel behind __ fence next to __ bus stop.

А1=16,4 d= -0,8 an=a1+(n-1)*d an=16,4+(n-1)*(-0,8)=16,4-0,8n+0,8=17,4-0,8n 17,4-0,8n<0 17,4<0,8n 0,8n>17,4 n>17,4/0,8 n=21,75 Відповідь: 21,75

 the park keeper found some litter in _а_ park he found _аn_ crisp packet. __ packet was in _a_ middleof_an_ footbal pitch.then he found _an_ old comic. _a_comic was under _a_ three hear _a_ lake.then he foundsome orange peel behind _a_ fence next to _a_ bus stop.