Answer:

Since the measurement can't be negative the correct answer for this case would be 
Step-by-step explanation:
Let's assume that the figure attached illustrate the situation.
For this case the we know that the original area given by:

And we know that the initial area is a half of the entire area in red
, so then:

And we know that the area for a rectangular pieces is the length multiplied by the width so we have this:

We multiply both terms using algebra and the distributive property and we got:

And we can rewrite the expression like this:

And we can solve this using the quadratic formula given by:

Where
if we replace we got:

And the two possible solutions are then:

Since the measurement can't be negative the correct answer for this case would be 
cube root on both sides then subtract 7
answer would be (cube rooted)A-7=Z if that makes sense
Answer:
67 degrees
Step-by-step explanation:
46 + 67 + x = 180
x = 67
Total shells Sandy had = 5
Shells Mageret got = 3
Balance of Seashells
5 - 3
2