A farmer has farmland that is a rectangle 4.5km long and 3km wide. He wants to completely cover the farmland in dirt.
He knows the area each truckload of dirt covers, but only in square miles.

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Larry wants to buy some carpeting for his living room. the length of the room is 4 times the width and the total area of the room is 16 square meters. what is the length of the living room