16x^4-54xhow would i simplify the epression?

It takes jonas 7 1/4 minutes to run the mile. it takes mario 8 5/12 to run the mile. how much faster is jonas than mario? 5/6 minute 1 1/3 minutes 1 1/6 minutes 1 1/2 minutesi will give points and brainlest

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

In the diagram, gef and hef are congruent. what is the value of x