Ireally need gwen pays the entry fee and buys 10 tickets. it costs her a total of $30. tristan pays the entry fee and buys 15 tickets. it costs him a total of $40. keith pays the entry fee and buys 10 tickets. it costs him a total of $30. in this task, let x represent the entry fee and y represent the cost of each ticket in dollars. how much gwen paid. y = 10x + 30 how much tristan paid. y = 15x + 40 how much keith paid. y = 10x + 30 answer this: which two equations could you use as a system to find the cost of the entry fee and the cost of each ticket? why?

Submarines control how much they float or sink in the ocean by changing the volume of air and water contained in large ballast tanks. when the tanks are completely full of water, the submarine increases its overall mass and sinks down to the bottom. when the tanks are completely full of air, the submarine reduces its overall mass and floats to the surface. depending on the density of the seawater surrounding the submarine, it will pump seawater in or out of the tanks in order to achieve the same overall density as the sea water and float neutrally in the water. the volume of the submarine never changes. when the tanks are completely full of water, a submarine with a volume of 7.8\times10^3\text{ m}^37.8×10 3 m 3 7, point, 8, times, 10, start superscript, 3, end superscript, space, m, start superscript, 3, end superscript has a total mass of 8\times10^6\text{ kg}8×10 6 kg8, times, 10, start superscript, 6, end superscript, space, k, g. the density of the seawater is 10^3\text{ kg/m}^310 3 kg/m 3 10, start superscript, 3, end superscript, space, k, g, slash, m, start superscript, 3, end superscript. to make that submarine float neutrally, and neither float nor sink in the ocean, what volume of water does that submarine need to subtract from its tanks?