It's something an object or a person could do or be used for. Example: the function of a clock is to tell time.
describe the notch and its function in the story
Photosynthesis
watatat
Blood filter
No, x = 4 is not a function. I would describe x = 4 as the solution to an equation.
describe the structure of a fruit
True
describe the general business travel
describe alternative ways of organising the information systems function in a business
Describe the normal function of the hematic system
a function is a one-to-one and many-to one relation
Yes, speed can be written as a function of time. The function would describe how the speed of an object changes over time. It can vary depending on factors such as acceleration, deceleration, and constant speed.