Bill and colin are cousins. right now bill is 21 years older than colin. in 13 years
bill's age will be twice colin's age. how old is colin right now? how old is bill?

Colin is 8 and Bill is 29

Step-by-step explanation:

29-8=21

8+13=21

29+13=42

21 is half of 42

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10

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