Please help with this math

11. minitab software was used to find the lsrl for a study between x=age and y=days after arthroscopic shoulder surgery until an athlete could return to their sport. use the output to determine the prediction model and correlation between these two variables. predictor coef se coef t p constant -5.054 4.355 -1.16 0.279 age 0.2715 0.1427 1.9 0.094 r-sq = 31.16%

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16