Miguel conducts a survey of 750 college students to see how many of them have a part-time job. His results show that 500 of the
1 answer:
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Answer:
Distance between the surface and source of light will be increased by 6 meters.
Step-by-step explanation:
The illuminance of a surface varies inversely with the square of ts distance from the light source.
Let illuminance of the surface = x lumens per square meter
and distance from a light source = y meter.
Now x ∝
Or [k = proportionality constant]
Now we will find the value of k.
k = xy²
k = 120×(6)²
k = 4320
We have to calculate the distance of the source if illuminance of the surface is 30 lumens per square meter.
y² =
y² = 144
y = √144 = 12 meters
So the source of the light will be shifted away from the surface = 12 - 6 = 6 meters.
Answer:
The solution of equation is 0.53,-7.53.
Step-by-step explanation:
Given : Quadratic equation
To find : The solution of equation ?
Solution :
The solution of the quadratic equation is
Here, a=1, b=7 and c=-4.
Substitute the values,
Therefore, the solution of equation is 0.53,-7.53.