The explicit rule for an arithmetic sequence is f(n) = 6 + 5(n − 1). What are the first
three terms?

1,6,11

Step-by-step explanation:

6+5(0-1) 1st term using 0

6-5

1

6+0 2nd term using 1

6

6+5(2-1) 3rd term using 2

6+5

11

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm