The first term of an arithmetic sequence is 6. the fourth is 21, find the equation for the nth term and find the 18th term

)

1

st term is  

2

and common difference is  

3

2)

1

st term is  

74

and common difference is  

−

10

n

th term of an A.P series is  

T

n

=

a

+

(

n

−

1

)

dStep-by-step explanation:

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950

these sign is used to tell weather the number is greater or less than the number   <   or >     but this sign means its equal =    

hope this you and

step-by-step explanation: