PLEASE HURRY!! Given 100 grams of bacteria that decreases at a rate of ½ per year. What would be an appropriate range after 4 years?

0≤x≤5

0≤x≤100

0≤y≤100

6.25≤y≤100

On a piece of paper graph y < 3x

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 (%)

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels