Answer:
multiply a term by 2 and add 1 to get the next term
Step-by-step explanation:
3×2=6 +1 =7
7×2=14+1= 15
15×2=30+1=31
A =

A = 3.14/4 x 10^2 = 78.5 inches square
Hope this helps.
Sin30= x/18
•18 •18
18sin(30)=x
Kx=y-m
x=(y-m)/k
Note that this is also standard linear form, x=y/k-m/k where slope=1/k and x intercept is -m/k.