Question

If a baby's mass at birth is 90 mg and it increases by 2 mg per year, what would be the baby's mass after 5 years?

a) 100 mg
b) 95 mg
c) 80 mg
d) 1000 mg

Answer 1

To find the baby's mass after 5 years, you multiply the annual increase of 2 mg by 5 years to get 10 mg and then add it to the initial mass of 90 mg. The result is 100 mg, which is option (a).

Step-by-step explanation:

The student has asked how to calculate the mass of a baby after 5 years given the initial mass at birth and the annual increase in mass. To solve this, we need to apply a simple linear equation that takes into account the initial mass and the constant yearly increase. Here's how it's done step by step:

1. Identify the baby's mass at birth: 90 mg.
2. Identify the annual increase in mass: 2 mg per year.
3. Calculate the total increase over 5 years by multiplying the annual increase by 5 years: 2 mg/year * 5 years = 10 mg.
4. Add the total increase to the initial mass to find the mass after 5 years: 90 mg + 10 mg = 100 mg.

Therefore, the baby's mass after 5 years would be 100 mg, which corresponds to option (a).