Last month, Brian made $132 mowing the neighbor's lawns, $68 babysitting, $42 doing household chores, and $78 walking pets. Estimate how much money Brian earned by rounding to the nearest ten first and then adding the rounded numbers.

Joe has a rectangular chicken coop. the length of the coop is 4 feet less than twice the width. the area of the chicken coop is 510 square feet. what is the length of the chicken coop?

Find the value of x that will make l ll m

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 (%)