What is the value of n when n = -4?

What's the difference between: x≥0 and nonnegative integer. ?

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

What is the lcm of 16 and 40 ? 24 and 40 ?