They have to be at least 40 abut less than 70, so 40 < (underlined) x < 70.
They have to be at least 60 inches but less than 75 inches tall, so 60 < (underlined) y < 75.
Graph the following lines:
x = 40
x = 70 (dotted)
y =60
y= 75 (dotted)
The square the four lines make is the answer. I hoped that help!