Answer:
Each one of the ten people has to shake hands with all the $20$ other people they don’t know. So $10\cdot20 = 200$. From there, we calculate how many handshakes occurred between the people who don’t know each other. This is simply counting how many ways to choose two people to shake hands from $10$, or $\binom{10}{2} = 45$. Thus the answer is $200 + 45 = \boxed{\textbf{(B)}\ 245}$.
Step-by-step explanation:
replace 15 for t in the equation
V915) = 20 + 7 cos(15) = 26.76148078 feet per second
26.76148078 x 15 = 401.4222118 feet
round off to 401.42 feet
The answer might be -32 I plugged it into my calculator
The correct answer would be irrational because 127 itself is irrational that square root is irrational
