A boat is traveling at 43.2 m/s. It then goes down a faster part of the river and is now going 144 m/s which gave the boat an acceleration of 25.2 m/s2. How long did it take the boat to reach its
new speed?

When are two distinct non vertical lines parallel

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

Precalculus question, image attached.