Find the area of a United States flag measuring 465 feet by 215 feet.{“version”:”1.1″,”math”:”Find the area of a United States flag measuring 465 feet by 215 feet.”}

Ultrasound frequencies are below 20 kHz and can be heard by humans.  

A thermos bottle minimizes heat transfer by radiation.

The speed of sound increases as temperature decreases in air.  

The refraction of light causes mirages due to frequency. 

The Curie temperature is the temperature below which a material becomes ferromagnetic.  

Please match the following concepts about antimicrobial resistance

Alternating current (AC) is used in homes because it is safer than direct current (DC).  

Significant figures are used to express the precision of measurements.

A hypothesis is a proven scientific fact.