A sound whispered at one focus of a whispering gallery can be heard at the other focus. Two people are standing in a whispering gallery whose cross section is a semielliptical arch with a height of 28 feet and a width of 90 feet. How far from the room's center should they stand so that they can whisper back and forth and be heard?

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.