Graph the following three equations on your own device and answer the questions below.
1: f(x)=5x+7
2: f(x)=x^2+6
3: f(x)=2^x+3

a. what is f(10)
b. what is f(100)
c. what is f(1000)
d. Which function has the highest value at each value of x?
e. Use your answers to decide which type of function will increase the fastest?
f. At what point did this function exceed the other two?
g. Do you think this would work for any function of this type? Why?
h. If these 3 equations represent the growth of mucus in a membrane, describe and state the domain and range for each function.

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What are the characteristics of each of the three functions?

a) In this part we must evaluate each of the three functions at the given value of x:

Case 1

f(10) = 5 · 10 + 7

f(10) = 57

Case 2

f(10) = 10² + 6

f(10) = 106

Case 3

f(10) = 2¹⁰ + 3

f(10) = 1027

b) In this part we must evaluate each of the three functions at the given value of x:

Case 1

f(100) = 5 · 100 + 7

f(100) = 507

Case 2

f(100) = 100² + 6

f(100) = 10006

Case 3

f(100) = 2¹⁰⁰ + 3

f(100) = 1.267 × 10³⁰ + 3

c) In this part we must evaluate each of the three functions at the given value of x:

Case 1

f(1000) = 5 · 1000 + 7

f(1000) = 5007

Case 2

f(1000) = 1000² + 6

f(1000) = 1000006

Case 3

f(1000) = 2¹⁰⁰⁰ + 3

f(1000) = (1.268 × 10³⁰)¹⁰ + 3

f(1000) = 10.744 × 10³⁰⁰ + 3

f(1000) = 1.074 × 10³⁰¹ + 3

e) The third function increases the fastest.

f) In this part we need to compare the third function with respect to the first and second functions:

5 · x + 7 = 2ˣ + 3

2ˣ - 5 · x   = 4

The solutions of the equation are x = - 0.675 and x = 4.81. The function will exceed the other first function at x = 4.81.

x² + 6 = 2ˣ + 3

2ˣ - x² = 3

The solution of the equation is x = 4.588. The function will exceed the other second function at x = 4.588.

g) Yes, exponential functions with bases greater than 1 will surpass polynomic function at any point x such that x > 0.

h) The domain represents the set of x-values of a function and the range represents the set of y-values of a function. Then, the domain and range of each function is:

Case 1

Domain - All real numbers.

Range - All real numbers

Case 2

Domain - All real numbers.

Range - [6, +∞)

Case 3

Domain - All real numbers.

Range - (3, +∞)

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