Brett lives 3/10(three tenth) mile from the school. If he rides his bike to and from school each day, Monday through Friday, how many miles does he ride in all? ***Remember that Brett must ride to and from school each day. I need help ASAP

Ineed to know the answer to this algebra question.

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

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.