1.Two materials that can be scratched by an iron mail are ___, ___ 2.What is the substance that can be scratched by an iron nail but not a penny?
Please answer

Sara is creating an experiment. her hypothesis states the following. if i increase the air in my tires, then i will get better gas mileage. if this is her hypothesis what column titles do we need in our date table? a. air pressure in tire (psi) and gas mileage (mph) b. air pressure in the atmosphere (psi) and gas mileage (mph) c. miles (m) and gallons per mile (g) d. old battery and new battery

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

What is the magnitude of the resultant vector round your answer to the nearest tenth