My pic rate my pic guys​

Aluminum–lithium (al-li) alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. a commercial aircraft skin material having a density of 2.47 g/cm3 is desired. compute the concentration of li (in wt%) that is required.

What is the independent variable in this investigation? mass volume sample number substance density

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal