If i were to be talking about life 50 years ago in spanish, would i use imperfect or preterite tense for verbs?

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Sheila conducts an investigation to see how the amount of salt dissolved in water affects the density of the water whichstatement best describes the correct plan for her procedure? the density and the amount of water are controls, and the amount of salt and the type of salt are variablesthe amount of water and the amount of salt are controls, and the type of salt and the density are variablesthe type of salt and the amount of water are controls, and the amount of salt and the density are variablesthe type of salt and the density of water are controls, and the amount of salt and the amount of water are variableso

Esta piña es mi piña. correct incorrect

Read and choose the correct verb conjugation to complete the sentence.la señora garcía y usted son científicos. ¿qué ustedes?   estudiamos  estudia  estudiáis  estudian