Chapter 7.7, Problem 23PPE

To determine

Toidentify:The initial amount “ a ” and the decay factor “ b ” in given exponential function.

Answer to Problem 23PPE

The speed of particle is at least 8 cm/sec in the subinterval.

Explanation of Solution

Given information:

The given exponential function is $y=5\cdot {0.5}^x$

Conceptused:

A function of the form $y\left(x\right)=a\cdot b^x$ is known as the exponential function. As $y\left(x=0\right)=a\cdot b^0=a$ , so “a” is known as initial amount of function $y\left(x\right)=a\cdot b^x$ and “ b ” is called as the growth $\left(ifb>1\right)$ of decay $\left(ifb<1\right)$ factor of function $y\left(x\right)=a\cdot b^x$ .

The given exponential function is

  $y=5\cdot {05}^x$  ... (1)

Comparing given function (1) with the function $y\left(x\right)=a\cdot b^x$ , $a=5$ and $b=0.5$ .

Thus, the initial amount of the exponential function $y=5\cdot {0.5}^x$ is $a=5$ and the decay factor $b=0.5$ .

Conclusion:

The initial amount of the exponential function $y=5\cdot {0.5}^x$ is $a=5$ and the decay factor $b=0.5$ .