Answer: b) 6
Step-by-step explanation:
Given : The illuminance of a surface varies inversely with the square of its distance from the light source.
i.e. for d distance and l luminance , we have
, where k is constant. (1)
If the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters.
From (1), we have
(2)
For the distance (d) corresponds to the illuminance to 30 lumens per square meter , we have
Put value of k , we get
Then , the number of meters should the distance of the surface from the source be increased= 12 meters- 6 meters = 6 meters.
Answer:
The length of each side of the base is
Step-by-step explanation:
we know that
The area of a square is equal to
where
b is the length side of a square
In this problem we have
so
substitute in the formula
Square root both sides
Answer:
D is the correct answer
Step-by-step explanation:
Since 5x and 4x+1 are both equal to y, we can set them equal to each other as shown below:
5x=4x+1
x=1
Plugging x=1 into y=5x gets us y=5(1)=5
So x=1 and y=5, which is also (1,5)
Hope this helped!
Answer:
Step-by-step explanation:
Answer:
4,2
Step-by-step explanation: