Training World magazine suggests that beginner runners build their training by increasing the minutes that they run each day using the sequence {7, 17, 27, 37,…} until they have completed a marathon. Which of the following is the recursive definition of this arithmetic sequence? an=an−1+10; a1=7

an=an−1−10; a1=7

an=an−1+10; a1=0

an=an−1−10; a1=0