500-liter tank full of oil is being drained at the constant rate of 20 liters per minute. Use function notation to write a linear function expressing the number of liters in the tank V after t minutes.

The function notation for expressing the number of liters in the tank V after t minutes will be .

Given,

The capacity of oil-tank is 500 litres.

The oil is drained at the constant rate of 20 liters per minute.

We have to express the number of liters in the tank V after t minutes.

Since the total capacity of tank is 500 litres, so we subtract number of litres drained from 500 litres.

Using function notation, after t minutes the volume remaining in the tank will be,

.

Thus the correct expression is .

For more details on function notation follow the link:

link

V=500-20t

Step-by-step explanation:

The slope is -20 so V= -20t they start with 500 so V=500-20t

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