Question

The depth y (in inches) of a lake after x years is represented by the equation y=0.2x+42 . How much does the depth of the lake increase in four years

Answer 1

Answer:

42.8 in

Step-by-step explanation:

Step one:

given data

we are told that the expression for the depth of a lake after x years is given by

$y=0.2x+42$

Required

The value of y when x= 4

Step two:

substitute the value of x in the expression to get y

$y=0.2(4)+42\\\\y=0.8+42\\\\y=42.8$

After 4 years the depth will increase by 42.8 in