Leticia cox is a biochemist. she is testing two different types of drugs that induce cell growth. she has selected two cultures of 1000 cells each. to culture a, she administers a drug that raises the number of cells by 200 each day and every day thereafter. culture b gets a drug that increases cell growth by 8% each day and every day thereafter. assuming no cells die, how many cells will have grown in each culture by the end of the seventh day? a. culture a: 1400 cells culture b: 713 cells c. culture a: 713 cells culture b: 1400 cells b. culture a: 800 cells culture b: 517 cells d. culture a: 517 cells culture b: 800 cells

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?