Im not sure about the second one, but for the first one, Alex’s height is 167.64 cm. :)
Answer:
F. 5:27
Step-by-step explanation:
4:20+67 minutes= 5:27
That's a right triangle with hypotenuse 3000 and the height y is the side opposite the elevation angle of 15 degrees.

We can actually compute

exactly but I won't bother.
That is false because, this type of system can have one solution, two solutions, or no solutions. Graph both equations on the same coordinate plane. Identify the point of intersection, if any.
Hope I Helped : )