Является ли число 21,4 членом арифметической прогрессии, первый член которой ревен 2,8 ,а шестой 4,3. если да, то найдете его порядковый номер

 

пожалуйста переведите                                                                                                      I have got a sister. She is nice and kind. Her name is Rose. She is five years old. She has got a lot of toys: four dolls, a doll"s house, two teddy bears, three balls and a bike. She likes to draw and play with her toys. Rose is a smart girl. She likes to ask a lot of questions. She asks mum, dad, and me a lot of questions every day. She asks her questions in the morning and in the evening. She asks a lot of questions: Why? Where? When? Who? What? How many? And many of her questions are funny. Read some of the questions: Why are the flowers beautiful? Do elephants go to school? Where does Santa claus livt? When is Tiny"s birthday? What is a teddy bear"s name? How many sweets can you eat? Can you answer Rose"s guestions? I can"t.

Перпендикулярны ли векторы c{-10;5} и {3;6}

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