Find the y-value at the relative minima,and use a graphing utility to check your result. 
Definitions:
Sonogram
An image formed using ultrasound waves, commonly used for checking fetal development during pregnancy.
Radiograph
An image produced on a sensitive plate or film by X-rays, gamma rays, or similar radiation, commonly called an X-ray.
CT Scan
A diagnostic imaging technique that uses computer-processed combinations of many X-ray measurements taken from different angles to produce cross-sectional images of specific areas of a scanned object.
MRI
Magnetic Resonance Imaging, a medical imaging technique used to visualize internal structures of the body in detail.
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