How to write thirty-four and twelve hundredths in standard form

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)