Tommy can lay a brick walkway by himself in 12 hours. Robert does the same job in 10 hours. Working together, how long will it take them to lay the brick walkway?
PLEASE HELP I NEED ASAP.

Solve 2x+y=3 x+y=5 in substitution method

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

The table below represents the displacement of a fish from its reef as a function of time: time (hours) x displacement from reef (feet) y 0 4 1 64 2 124 3 184 4 244 part a: what is the y-intercept of the function, and what does this tell you about the fish? (4 points) part b: calculate the average rate of change of the function represented by the table between x = 1 to x = 3 hours, and tell what the average rate represents. (4 points) part c: what would be the domain of the function if the fish continued to swim at this rate until it traveled 724 feet from the reef? (2 points)