Un científico usa un submarino para estudiar la vida marina. Ella comienza al nivel del mar, que es una elevación de 0 pies.
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• Ella viaja hacia abajo 72.8 pies.
Luego viaja directamente hasta 25.3 pies.
• A continuación, desciende por segunda vez, 20 metros.
¿Cuántos pies debe ascender ahora para volver al nivel del mar?

Your vet has placed your pet on a diet. the diet is to contain at least 12 mg of fat and at least 14 mg of protein per serving. these requirements are to be obtained from two food sources. source a contains 2 mg of fat and 2 mg of protein per serving. source b contains 1 mg of fat and 3 mg of protein per serving. if source a sells for $1.28 per serving and source b sells for $1.12 per serving, how many servings of each type should be purchased to satisfy the requirements at minimal cost?