/answer! from 1980 to 1990, lior’s weight increased by 25%. if his weight was k kilograms in 1990, what was it in 1980?

The weight in 1980 is kilograms

Solution:

From 1980 to 1990, Lior’s weight increased by 25%

His weight is "k" kilograms in 1990

To find: weight in 1980

This is a percentage increase problem

Let "x" be the weight in kilograms in 1980

The percentage increase is given by formula:

Here,

Initial value in 1980 = x

Final value in 1990 = k

Percentage increase = 25 %

Substituting the values in formula,

Thus the weight in kilograms in 1980 is

the answers c

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value