You are asked to find the minimal cost of materials to construct a rectangular storage container with an open top having a volume of 10 m3. The length of the base is twice the width. Material for the base cost 15 per square meter, and material for the sides costs 5 per square meter. Let C represent the cost, w the width of the box, l the length of the box, and h the height of the box. Required:
Write down the equation that should optimize to find the minimal cost of materials to construct the box.

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.