Answer:

Step-by-step explanation:
This is a difference of squares that has the form and factors to:

Here take the square root of each term for the factors.

Answer:
no solution
Step-by-step explanation:
Subtract 7 from both sides of the inequality:
|x| +7 -7 < 4 -7
|x| < -3
This has <u>no solution</u>, because an absolute value cannot be negative.
Answer:
<u><em>The error Vikam made:</em></u><u><em> He actually used the wrong expression to represent the area of the base of the given pyramid. </em></u>
Step-by-step explanation:
The surface area of the pyramid that is given = 4 * (0.5 * 34.2 * 28.4) + 34.2 * 34.2
Now, the Total area of it is = (2 * 0.5 * 36.5 * 25.6) + (2 * 0.5 * 37.8 * 16.2) + (25.6 * 16.2)
= (36.5 * 25.6) + (37.8 * 16.2) + (25.6 * 16.2)