A) Find the value of 2x + y when x = 4 and y = 3 b) Find the value of a^2 + b when a = -2 and b = 5

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.

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

Collin did the work to see if 10 is a solution to the equation r/4=2.4