A rock is thrown from the top of a tall building. The distance, in feet, between the rock and the ground t seconds after it is thrown is given by d(t)=−16x^2−4x+382. How long after the rock is thrown is it 270 feet from the ground? Please round to the nearest tenth and do not forget your units.

Find the power series expantion of f(z)=log(4=3z) at the point z=-1

Equation for the calculation double 2 and then add 5

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?