I need help with these fractions

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?