Uma wants to recreate the discovery of superconductivity. Which describes the materials needed?
a tool to increase temperatures, copper, resistance, a tool to measure electric current
a tool to drop temperatures, mercury, an electric current, and a tool to measure resistance
a tool to drop temperatures, mercury, resistance, a tool to measure electric current
a tool to increase temperatures, copper, an electric current, and a tool to measure resistance
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trig 15.3 cos

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

i think its d if wrong im sorry