The graph shows the f(x). Which is true? a.(−/2)f(−π/2) and (/2)f(π/2) are both equal to 1
b.
f is discontinuous at both −/2−π/2 and /2π/2
c.
The one-sided limits of f at =−/2x=−π/2 are both defined
d.
Whenever a 2-sided limit for x between −−π and π is defined, it is equal to ()

Just tell me how to set up the equation.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?