arithmetic sequence (1 Viewer)

[kr73114]

nth term is Tn=7+4n
what is the last term less than 1000 and first term greater than 1000
and also which and how many terms are in between 200 and 300

can someone please help? i dont understand the method for this

 

[hscishard]

nth term is Tn=7+4n
what is the last term less than 1000 and first term greater than 1000
and also which and how many terms are in between 200 and 300

can someone please help? i dont understand the method for this

1. 7 + 4n=100 0
4n=993
n=248 (rounded down)
n=249 for > 1000

2. 200<7+4n<300

193 <4n< 293
193/4 < n <293/4

Minus the two bounds to get the number of terms.
=25 from calc