Answer:
(a) Jerry expect to reach his goal by week 43rd.
(b) The total number of push-ups Jerry will have done when he reaches his goal is 2,537.
Step-by-step explanation:
It is provided that Jerry wants to do 100 push-ups. He started with 17 push-ups in Week 1 and planned to increase the number of push-ups by 2 each week.
the number of push-ups done each week by Jerry follows a arithmetic progression with the first terms as, a = 17, common difference as, d = 2 and the last terms as, l = 100.
(a)
Compute the number of week it takes Jerry to reach his goal as follows:
The nth term of an AP is:
[tex]t_{n}=a+(n-1)d[/tex]
Compute the value of n as follows:
[tex]t_{n}=a+(n-1)d[/tex]
[tex]100=17+(n-1)\cdot 2\\\\100-17=(n-1)\cdot 2\\\\83=2n-2\\\\2n=85\\\\n=42.5\\\\n\approx 43[/tex]
Thus, Jerry expect to reach his goal by week 43rd.
(b)
Compute the total number of push-ups he will have done when he reaches his goal as follows:
The sum of n terms of an AP is:
[tex]S_{n}=\frac{n}{2}\cdot [2a+(n-1)d][/tex]
Compute the sum as follows:
[tex]S_{n}=\frac{n}{2}\cdot [2a+(n-1)d][/tex]
[tex]=\frac{43}{2}\cdot [2\cdot 17+(43-1)\cdot 2]\\\\=43\cdot [17+42]\\\\=2537[/tex]
Thus, the total number of push-ups Jerry will have done when he reaches his goal is 2,537.
