What two numbers multiply to give you -36 but add or subtract to give you -9

For all machines-not just hammers- the user applies force force to the machine to the machine over a certain distance. question 1 options: input output duo none of the above

What is tge speed of sound in dry air at 0°c

Secondary school falls between a . kindergarten & elementary b. elementary school & post secondary school c. post secondary school & higher education d. middle school & high school