Cool water at 9.0°C enters a hot-water heater from which warm water at
temperature of 80 °C is drawn at an average rate of 0.3 kg min-¹ . How much
average electric power does the heater consume in order to provide hot
water at this rate? The specific heat capacity of water is given to be 4200Jkg-¹°C-¹
and assume that there is negligible heat loss to the surrounding

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 c if i'm wrong