"Et al" would be the Latin phrase that is used with the primary author's name when a book has more than three authors, the reason why this Latin phrase is used is because this means "and others" that refers to the other authors that wrote the book.
The answer is 7 How to solve your problem
4
+
4
+
4
+
4
+
4
+
8
=
4
4
+
4
+
4
+
4
+
4
+
8
=
4
x
Solve
1
Add the numbers
4
+
4
+
4
+
4
+
4
+
8
=
4
4
+
4
+
4
+
4
+
4
+
8
=
4
x
2
8
=
4
28
=
4
x
2
Divide both sides of the equation by the same term
2
8
=
4
28
=
4
x
2
8
4
=
4
4
28
4
=
4
x
4
3
Simplify
Divide the numbers
Cancel terms that are in both the numerator and denominator
Move the variable to the left
=
7
x
=
7
Solution
=
7
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