Answer:
C.
Step-by-step explanation:
Recall that:
For this particular question, you just have to look for the radical containing a negative sign under the square root i.e a negative radicand.
That will be option C.
This is given as
This can be rewritten to reveal the complex part as:
Therefore the correct answer us option C
Answer:
The equation should look something like this.
Be careful with your use between cubing and multiplying; Cubing is multiplying the number by itself multiple times, while multiplying is like repeated adding, yet much easier.
In this case, if it says triple, I highly recommend multiplying by 3, which is what I did, it only looks different because it is in parentheses.
What have we learned?
<h3>We learned how to write algebraic equations, and some further information on multiplying.</h3>
Answer:
The length of the shadow is increasing with the rate of 1.5 feet per sec
Step-by-step explanation:
Let AB and CD represents the height of the lamppost and child respectively ( shown below )
Also, let E be a point represents the position of child.
In triangles ABE and CDE,
( right angles )
( common angles )
By AA similarity postulate,
∵ Corresponding sides of similar triangles are in same proportion,
We have, AB = 12 ft, CD = 4 ft, BE = BD + DE = 6 + DE,
Now, the speed of walking = 2 mph =
Note: 1 mile = 5280 ft, 1 hour = 3600 sec
Thus, the time taken by child to reach at E
= 2.045 hours
Hence, the change rate in the length of shadow
= 1.5 ft per sec.
