I need you guys help simplifying these questions!! 1. 6n+5(10n−7)
2. 3−10(4p−1)
3. −4(8k+5)−5(9k+4)

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

Solve the system of equations y= 3/2 - 1, -x+ y =-3

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.