By their increase or decrease
Answer:
73 mph during the second hour!
Step-by-step explanation:
Hour 1=54 mph
Hour 2=? mph
Hour 3=82 mph
Total=209 mph
this means that 209=82+54+?
Simplify it and you will get 73
73 mph
Y = mx + b
in this case m = 2 and b = 1 so
equation
y =2x + 1
hope this helps