Answer:
-1/7
Step-by-step explanation:
(y2-y1)/(x2-x1)
4-5 / 2- -5
-1/7
Answer:
dy/dx = -1 /√(1 - x^2).
Step-by-step explanation:
y = arccos x.
So x = cos y
dx / dy = - sin y
dy / dx = -1 / sin y
But sin y = √( 1 - cos^2 y)
But cos y = x , so cos^2y = x^2
Therefore
dy/dx = -1 / √(1 - x^2).
Step-by-step explanation:
Here,
by formula a^2+b^2=(a+b)^2-2ab
so,
or,(a+b)^2-2ab
or,(73)^2-2×65
or,5329-126
=5203 is the answer
Answer:
The train travels 40 m
Step-by-step explanation:
* Lets explain how to solve the problem
- The distance = speed × time
- The train travels 80 mph for 30 minutes
∵ The train travels at speed 80 mph
∵ The train travels for 30 minutes
- We must change the minutes to hours
- There are 60 minutes in an hour
∵ 1 hour = 60 minutes
∴ 1 minute = 1/60 hour
∵ The train traveled for 30 minutes
∴ The train traveled for = 30 × 1/60 = 1/2 hour
∵ Distance = speed × time
∵ The speed = 80 mph
∵ The time = 1/2 h
∴ The distance = 80 × 1/2 = 40 m
* The train travels 40 m
