Solve the following and express each answer in scientific notation and to the correct number of significant figures. a). (5.3 x 10^4) + (1.3 x 10^4) b). (7.2 x 10^-4) /(1.8 x 10^3 c). 10^4 x 10^-3 x 10^6 d). (9.12 x 10^-1) - (4.7 x10^-2 e). (5.4 x 10^4) x (3.5 x 10^9)

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na