I'm assuming it's 57. Because 1/2 can equal .5 and 56.5+.5=57
Answer:
2nd and 3rd
Step-by-step explanation:
Answer:
Ultrasound
Step-by-step explanation:
Ultrasounds use sound waves to create images in real time. Therefore, medical doctors can use these to observe internal organs <em>and </em>blood vessels.