Astudent has grades on 3 examinations of 76,80,and 72. what must a student earn on a 4th examination to have an average of 80

92

Step-by-step explanation: 80=(76+80+72+x)/4

X=(4*80)-(76+80+72)

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