Question

Cleo the black lab runs to pick up a stick on the ground at the location x = 3.0 m . The equation of motion for Cleo is x = –12.6 m + (5.7 m/s )t.

Where is Cleo at t = 1.8 s ?

Answer 1

They GAVE you the equation AND the value of the variable.
What more can you ask for ? ! ?

The equation: x = -12.6 + 5.7 t

The value of 't': 1.8
______________________________

The equation: x = -12.6 + 5.7 t

Write the value in place
of 't' in the equation: x = -12.6 + 5.7 (1.8)

Multiply the 5.7 by the 1.8: x = -12.6 + 10.26

Add the -12.6 and the 10.26 : x = -2.34

It makes no difference where the stick is.
That's just extra numbers placed there to distract you.