Question

Graph the exponential function.
Y=5(2)^x

Answer 1

Answer:

Option A is correct.

Explanation:

Exponential function: The function is given by : $y = ab^x$ .....[1];

where a≠0 is the initial value and base b>0 , b≠1 and x is any real number.

Given: The exponential function: $y =5 (2)^x$              ......[2]

On comparing  above with  equation [1] we have,

a =5 and b = 2>1

Since, the domain is all Real numbers and the range is all positive real numbers except 0.

To find y-intercept;

Substitute x = 0 to solve for y;

Substitute in [2] we get;

$y= 5(2)^0 = 5\cdot 1 = 5$     [Remember any number to the zero power is 1 ].

Therefore, the  graph has a y-intercept at (0,5).

*If b > 1, then, the  graph increases.

or

we can say that the greater the base, b the faster the graph rises from left to right

and  

If 0<b<1 , then the graph decreases.

Therefore, the given exponential function graph  increases because b = 2>1 .

End behavior of the given function $y =5(2)^x$ ;

As $x \rightarrow +\infty$ then, $y \rightarrow +\infty$

And for $x \rightarrow -\infty$ then, $y \rightarrow 0$

Answer 2

Answer:

1. A) (the graph is in the growth direction)

2. B) 130% increase

3. D) f(x)= 175 (1.22)^x ; 473

4. C) 7 years

5. D) y= 110(0.9)^x

Step-by-step explanation:

U7 L1