answer:Certainly! You can achieve this by using the following Python code: ```python def list_sum(nums): '''This function will take a list as input and return the sum of its elements.''' result = 0 for num in nums: result += num return result nums = [2, 5, 10, 15] print(list_sum(nums)) ``` The `list_sum` function takes a list (`nums`) as input and iterates over each element in the list. It then accumulates the sum of the elements in the `result` variable. Finally, it returns the computed sum. In the provided example, we have a list `nums` containing `[2, 5, 10, 15]`. The `list_sum` function is called with this list as the argument, and the calculated sum is printed using `print(list_sum(nums))`. You can modify the `nums` list to include any numbers you want, and the function will compute the sum accordingly.

answer:To determine the relative position of the two circles, we first need to write the equations of the circles in their standard forms to find the centers and radii. For circle c_{1}: x^{2}+y^{2}-4x-6y+9=0, completing the square for both x and y gives us the standard form of the equation of a circle: [ (x-2)^{2}+(y-3)^{2}=4. ] This represents a circle centered at C_{1}(2, 3) with a radius of r_1 = 2. Similarly, for circle c_{2}: x^{2}+y^{2}+12x+6y-19=0, after completing the square, we get: [ (x+6)^{2}+(y+3)^{2}=64. ] This describes a circle centered at C_{2}(-6, -3) with a radius of r_2 = 8. To find the distance d between the two circle centers C_{1} and C_{2}, we use the distance formula: [ d = sqrt{(2 - (-6))^{2} + (3 - (-3))^{2}}. ] Simplifying the expression inside the square root, we have: [ d = sqrt{(8)^{2} + (6)^{2}} = sqrt{64 + 36} = sqrt{100} = 10. ] Now, by comparing the distance d between the two circle centers to the sum of their radii, r_1 + r_2 = 2 + 8 = 10, we find that d = r_1 + r_2. Therefore, the two circles are externally tangent to each other. So the correct answer is: [ boxed{C: Externally tangent}. ]

answer:In this fantasy world, there are no traditional reminders or digital calendars. However, as a powerful wizard, I can cast a spell to remember the task. With a wave of my staff and a flick of my wrist, I incant: By the power of the ancient lore and the wisdom of the sages, Let not this task be forgotten, let it not fade with the ages. When the sun next sets on the day of Freyja, Bring forth the memories of the client's parley. The magic swirls around us, imprinting the reminder in your mind. When the sun sets on Friday, you will remember to work on the client presentation.

answer:What a fascinating concept for a mystery novel. To weave together a narrative where multiple witnesses contribute to the unfolding of the crime and its solution, you might consider employing a structure that combines multiple perspectives and timelines. Imagine a story that begins with the discovery of the crime, and as the investigation unfolds, different witnesses come forward, each sharing their own account of what they saw or experienced. These accounts could be presented in a non-linear fashion, with each witness's testimony shedding new light on the events surrounding the crime. You could use an interviewer, such as a detective or journalist, to solicit these accounts from the witnesses, allowing the reader to piece together the puzzle alongside the investigator. This would create a sense of immediacy and intimacy, drawing the reader into the world of the story. To add an extra layer of complexity, you might consider using unreliable narrators or witnesses with their own agendas, which would force the reader to question the accuracy of their accounts. This would keep the reader on their toes, guessing and speculating as the story unfolds. As the investigation progresses, the accounts could begin to overlap or contradict one another, creating tension and suspense. The reader would be tasked with sifting through the various testimonies to discern the truth, mirroring the detective's own process of piecing together the puzzle. To bring the story to a satisfying conclusion, you could have the detective or investigator synthesize the various accounts, revealing the surprising truth behind the crime. Alternatively, you could leave some threads open to interpretation, allowing the reader to draw their own conclusions, adding to the mystery's allure. Throughout the narrative, consider using subtle clues, red herrings, and clever plot twists to keep the reader engaged and invested in the mystery. By carefully balancing the various accounts and timelines, you can create a gripping, immersive story that will keep readers on the edge of their seats, eager to uncover the truth. Some possible techniques to explore include: * Using different narrative voices or styles to distinguish between witnesses * Incorporating physical evidence, such as documents, recordings, or photographs, to supplement the witness accounts * Employing non-linear storytelling to create suspense and surprise * Experimenting with multiple timelines to reveal the events leading up to the crime and its aftermath * Introducing conflicting accounts or testimony to create tension and uncertainty By embracing the complexities of multiple perspectives and timelines, you can craft a rich, engaging mystery novel that will challenge and reward your readers.