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| Section | Objectives |
|---|---|
| Topic 1: Linear Functions and Systems | - Linear Equations
|
| Topic 2: Polynomial and Rational Expressions | - Polynomials
|
| Topic 3: Foundations of Algebra | - Algebraic Expressions
|
| Topic 4: Functions and Graphs | - Graphing Functions
|
| Topic 5: Exponential and Logarithmic Concepts | - Exponential Functions
|
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問題 #99
A vehicle is travelling away from a rest stop. The function
D(t)=48t+23
represents the distance from the vehicle to the rest stop at time t, where t is measured in hours and D is measured in miles.
What is the value of D(1.7)?
答案:A
解題說明:
The function is:
D(t)=48t+23
This is a linear function because it has the form:
D(t)=mt+b
where:
48
is the rate of change, and:
23
is the starting distance from the rest stop.
We need to find:
D(1.7)
That means substitute:
t=1.7
into the function.
D(1.7)=48(1.7)+23
First multiply:
48(1.7)=81.6
Now add 23:
D(1.7)=81.6+23
D(1.7)=104.6
So the vehicle is:
104.6 miles
from the rest stop after 1.7 hours.
問題 #100
A set of data was gathered and used to create a model for the number of subscribers to a blog. The function model is f(x)=190× # 0.99 #