Siobhan wants to measure the mass of a bag of flour. what should she do? use a balance and record the data in kilograms use a beaker with water and record the data in newtons use a balance and record the data in newtons use a beaker with water and record the data in kilograms

Explanation:

To answer this question, we need to know the difference between a balance and a scale.

A balance measures mass. In other words, a balance measures the amount of matter of an object. This measure is made by comparison with an object which mass is already known.

On the other hand, a scale measure weight, which is Netwons. Because a scale doesn't compare the unknown mass with another known mass. A scale measure the force due gravity exerted on an object.

Therefore, the right answer here is the first choice: Use a balance and record the data in kilograms.

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.