Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the square of a number increased by 5 times the number is equal to 176. find the number. the number is

Itook a better photo of the question so y’all can see it i hope it’s a fine photo

Pls , the question is in the picture!

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.