 
 <translate> Give the step-by-step reasoning process and then the final answer. Jacob takes four tests in his physics class and earns 85, 79, 92 and 84. What must he earn on his fifth and final test to have an overall average of 85? <ibo> Kwuo otú e si atụgharị uche n'isiokwu ahụ, kọwaa nke ọ bụla n'ime ha, ma kwuo ihe bụ azịza ya. Jacob na-eme ule anọ n'ọmụmụ ihe physics ya ma nweta 85, 79, 92 na 84. Gịnị ka ọ ga-enwerịrị na nke ise ya na nke ikpeazụ ya iji nweta akara nkezi nke 85? 