25 mph the train is accelerating at a constant rate<span />
Answer:
The answer is
<h2>

</h2>
Step-by-step explanation:

To find the inverse of f(x) , equate f(x) to y
That's
y = f(x)
We have

Next interchange the terms that's x becomes y and y becomes x

<u>Next solve for y</u>
Move 3 to the other side of the equation
That's

<u>Divide both sides by 25</u>

We have the final answer as

Hope this helps you
Answer:
a. 
b. x = 4 (see steps below)
Step-by-step explanation:
Since the two polygons are similar, the sides are proportional to each other. Using a proportion, you can solve for 'x' using cross-multiplication and division:

Cross-multiply: 15(x + 3) = 21(x + 1)
Distribute: 15x + 45 = 21x + 21
Subtract '15x' from both sides: 15x + 45 - 15x = 21x + 21 - 15x or 45 = 6x + 21
Subtract '21' from both sides: 45 - 21 = 6x + 21 - 21 or 24 = 6x
Divide by 6 on both sides: 24/6 = 6x/6
Solve for x: x = 4