Answer:
Step-by-step explanation:
Let x represent the time that they spent biking at the first speed.
If the ride was six hours long, it means that the time they spent biking at the other speed is (6 - x) hours.
Distance = speed × time
For the first part of the ride, they biked at a speed of 7 mph. This means that the distance travelled during the first part of the ride is
7 × x = 7x
For part of the ride, they biked at a speed of 11 mph. This means that the distance travelled during the second part of the ride is
11(6 - x)
Since the total distance that the kids traveled is 54 miles, then
11(6 - x) + 7x = 54
66 - 11x + 7x = 54
11x - 7x = 66 - 54
4x = 12
x = 12/4 = 3
They spent 3 hours biking at the first speed.
They spent 6 - 3 = 3 hours biking at the other speed.
QUESTION:- find the value of x
<h2>ANSWER:- </h2>
Answer:
5088
Step-by-step explanation:
The initial value of the car is $19340
The rate of decrease is 12.5%
The value of the car after 10 years is given by
Substitute the values to get;
To the nearest dollar we have $5088
The correct answer is choice C
Answer:
The rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities are:
a) 0.52
b) 2.63
Step-by-step explanation:
The rate of change of a function at a given point P can be obtained by evaluating the 1st derivative of the function in P. Thus,
Now for we just need to evaluate in each of the given points
a)
b)
Decibel is directly proportional to number of cars passing the point. That is,
69 db ----- 139 cars
x db ----- 17 cars
x = number of cars passing the point per minute on a weekend.
Then,
x= (69*17)/139 = 8.43 db ≈ 8 db