What is the answer to ×-y+6; use ×=6,and y=1

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

Select the term that describes the linear portion in this quadratic equation 7x^2-12x+16=0 a) -12x b) 7x^2 c) 16