Formula: Distance = rate * time
570 = (R+(R-18))*3
570 = (2R - 18)*3
190 = 2R-16
208 = 2R
R = 104
Eastbound Train: 86mph
Westbound Train: 104mph
(x + a)/(ax) = b/x
a= 2
b = 5
(x + 2) /(2x) = 5/x
cross multiply
x * (x+2) = (2x)*5
x^2 + 2x = 10x
x^2 - 8x = 0
x ( x -8) = 0
We get two solutions
x = 0, 8
the solution 0 is extraneous
the solution 8 is valid.
Answer:
The value of x in terms of b is:
The value of x when b is 3 is: x = -1
Step-by-step explanation:
We are given the function:
First we need to find
The value of x in terms of b
We need to find value of x
Multiply -2 with terms inside the bracket
Subtract 10 from both sides
Divide both sides by -2b
So, The value of x in terms of b is:
The value of x when b is 3
We have the equation for the value of x in terms of b:
Put b = 3
So, The value of x when b is 3 is: x = -1
You have to use distributive property then you combine like terms