The human population doubles approximately every 50 years. if there were 2.5 million people in 1950, how many people are forecasted to populate the earth in 2050?

Can someone pls ! pls answer all. no explanation needed..

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 base of a rectangular pyramid is 13 inches long and 12 inches wide. the height of the pyramid is 8 inches. what is the volume of the pyramid