Let's simplify step-by-step.
<span><span>12<span>x^2</span></span>+<span>9<span>x^2
</span></span></span>Combine Like Terms:
<span>=<span><span>12<span>x^2</span></span>+<span>9<span>x^2
</span></span></span></span><span>=<span>(<span><span>12<span>x^2</span></span>+<span>9<span>x^2</span></span></span>)
</span></span><span>=<span>21<span>x^<span>2</span></span></span></span>
Step-by-step explanation:
Meeting ID: 347 720 4583
Passcode: 12345
Answer:
520miles per day
Step-by-step explanation:
2080/4=520
So,
3 CD's sell for $13.20 each.
3 * 13.20 = $39.60
$39.60 is also the price for 2 DVD's.
Divide $39.60 by 2.
$19.80
Each DVD is $19.80.
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.