Creating a new vector from multiple operations

Hi I want to save the result of some operations in a new vector. Let´s say I have this tibble


my_data <- tibble(
                  Var_1 = c(900, 1500, 350, 1200, 750, 100,125,250,300),
                  Var_2 = c(385, 988, 150, 355,555, 900,20, 25, 500),
                  Var_3 = c(2.2, 3.1, 8.2, 4.2, 5.3, 6.8, 12, 25, 1))

And I want to perform some operations like


How I create a new vector to save the result of this 3 operations?
Thanks in advance

(new_vec1 <- c(sum(my_data$Var_1) ,
(new_vec2 <- my_data %>% summarise_all(sum) %>% unlist)
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you could do it for as many dataframes as you like, and then combine the results together with c()
you could iterate with the purrr package functions if needed.

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Many thanks,
If the data came from differents dataframes is still posible to use the dplyr way?