Найдите сумму первых восьми членов арифметической прогрессии: а) -23; -20;... ; б) 14,2; 9,6;... .

Плиз, помогите....((( Мне нужно правильное чтение на английском этих слов, точнее песни(((( Без ошибок(((

No new years's day to celebrate No chocolate covered candy hearts to give away No first of spring No song to sing In fact here's just another ordinary day No April rain No flowers bloom No wedding saturday within the month of June But what it is Is something true Made up of these 3 words That I must say to you I just called to say I love you I just called to say How much I care I just called to say I love you And I mean it from the bottom of my heart No summer's high No warm July No harvest moon to light one tender August night No autumn breeze No falling leaves Not even time for birds to fly to southern skies No libra sand No halloween No giving thanks to all the Christmas joy You Bring But what it is Though old so new To fill your heart Like no 3 words Could ever do. I just called to say I love you

Определите ускорение свободного падения на поверхности Марса при условии, что там математический маятник длиной 0,4 м совершил бы 20 колебаний за 40 с.

Какое значение имеет листопад в жизни растений?