while working on a roof, Rob dropped his hammer. The hammer's fall can be represented by the equation h= 16t^2+20. How long will it take the hammer to reach the ground?

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation

If julia has a value of x5.4 that is equivalent to x10.9 true or false. explain

How would you describe the difference between the graphs of f(x) = 2x2 and g(x) = -2x2?