3

local function multiply_list_with_number(list, int, new_int)
    for index in ipairs(list) do
        list[index] = list[index] * int + new_int
    end
end

local list = {0, 2, 4, 5}

multiply_list_with_number(list, 2, 5)

print(list) >> {5, 9, 13, 15}

-- ipairs works similar to pairs, however it has some differences
-- 1. it breaks the loop when value it loops through is nil
-- 2. it loops in order so if your array looks similar to this
    list = {}
    list[1] = 25
    list[3] = 50
    -- the ipairs loop will break after the first index because
    -- list[2] is not assigned to anything, it's nil