Hey what is the slope of the line and what is the value of n

The data in the table represent the height of an object over time. which model best represents the data? height of an object time (seconds) height (feet) 05 1 50 2 70 3 48 quadratic, because the height of the object increases or decreases with a multiplicative rate of change quadratic, because the height increases and then decreases exponential, because the height of the object increases or decreases with a multiplicative rate of change exponential, because the height increases and then decreases

What is the definition of exponential decay?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12