Which of the following is the correct notation for the complex number √-64-12

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar