What is the effect of inserting parentheses into a numerical expression

Calvin is a 12-year-old boy. due to pressure from his friends, he has started consuming certain toxic materials that are addictive and harmful. calvin is a victim of what type of abuse? a. sexual b. substance c. physical d. emotional

What is the name of the device that senses the current flowing,tripping the circut,and cutting off the electricity

How much money is wasted on fraudulent health products each year in the us