What is the y-intercept of y = 3 - 4x?

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What is the y intercept of f(x)=(1/2)^x?

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 (%)