Solve the equation or formula for the indicated variable.
s=2rt+1 for t

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

What is the product? a-3/15a × 5/a-3

Yvaries inversely as x. y =12 when x=5. find y when x=4