What is the nth term of the sequence -1,3,7,11 ?

The th term is

Step-by-step explanation:

The th term of an arithmetic sequence has the form

where is the common difference between consecutive terms of the sequence and is the first term of the sequence.

Here the sequence is

The th term

The th term is

y=x+9

?

step-by-step explanation:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft