Step-by-step explanation:
The answer for third is D, you have multiple choice in fourth which I can't see at all...
Rational: Any number that can be expressed as a fraction (or a ratio.)
Irrational: Not rational, any number that can't be written down as a fraction. Some examples include

,

, and so on.
Answer:
GCF(15a; 28b²) = 1
Answer:
After 100 songs
Step-by-step explanation:
2.50x=1.50x+50
.50x=50
÷.50
X=100
Answer:
14/21
Step-by-step explanation:
14/21 is divisible by 7, and can reduce to 2/3