Hello, i need in a compound inequality word problem:
emily is three years older than twice her sister mary's age. the sum of their ages is less than 30.
let x represent mary's age.
which inequality represents mary's possible age?
1. 0 2.0 3.0 4.0

The compound inequality is

Step-by-step explanation:

Consider the provided information.

It is given that Emily is three years older than twice her sister Mary's age.

Let x represent Mary's age.

Then the age of Emily is: 2x+3

The sum of their ages is less than 30.

This can be written as:

As we know the age can't be a negative number.

Therefore, the age of Mary must be a positive number greater than 0.

Thus, the compound inequality is

  about 5.6 days

step-by-step explanation:

we can fill the given information into the decay equation and solve for the value of t at which half the sample remains.

the half-life is about 5.6 days.