How do you make 30 with only 1, 4, 5 and -5?

(4+1)-(5*-(5))

Step-by-step explanation:

4+1=5; 5*(-5)=(-25); 5-(-25)=30

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