The perfect squares,1,4,9,16, are closed under (a)addition (b) multiplication (c) square-rooting (d) none of these

With this question! what is process of elimination? ? p. s. my brothers acc got banned so add his new one @ yamauchiyamyam17

The distributive property allows you to say that 3(x − 1) = 3x −

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.