Answer:
24
Step-by-step explanation:
Each person shakes 7 hands, but once you count the handshake between A and B, you don't need to count the handshake between B and A. There are a total of 8*7/2 = 28 handshakes.
Answer:
4
Step-by-step explanation:
The given expression is

THe given expression is a rational expression, and rational expression should not have 0 in the denominator.
Moreover, the denominator is a square root term, and square root don't have a value for negative number .
Therefore 2x+10 must be greater then 0. That is

Therefore the required domain in set builder form is
{
}