let her lunch = l, her gym clothes = g, her books = x
20 pounds is the amount she can carry
her lunch (1) weighs 0.75 lbs
her clothes (1) weighs 2.3 lbs
her books (x) = 3.4 lbs
Set the inequality
3.4x + 2.3 + 0.75 ≤ 20
Simplify
3.4x + 3.05 ≤ 20
3.4x + 3.05 (-3.05) ≤ 20 (-3.05)
3.4x ≤ 16.95
3.4x/3.4 ≤ 16.95/3.4
x ≤ 4.99 (rounded)
x ≤ 4.99 can be one of your inequalities.
her books can weigh up to 4.99 pounds before her backpack breaks
hope this helps
Answer:

Step-by-step explanation:

When there is a ( + ) in front of an expression in parentheses, there is no need to change the sign of each term. That means, the expression remains the same. Just remove the parentheses

Collect like terms

Subtract 3 from 12

Collect like terms

Hope I helped!
Best regards! :D
So this is direct proportional question
so y=(k)x
sub y=48 and x=6
48=6k
k=8
now you got a constant k
now sub x=3
y=(8)(3)
=24