360/9= 40
180-40= 140
140/2= 70
X=70
The answer would be 3 because 15-4=11, each book is 3.5 pounds
3.5+3.5=7
7+3.5=10.5
The equation which shows the one way to determine the factors of provided equation by grouping is,

<h3>What is a factor of polynomial?</h3>
Polynomial equations is the expression in which the highest power of the unknown variable is n (n is real number).
Factor of a polynomial is the terms in linear form, which are when multiplied together, give the original polynomial equation as result.
The provided polynomial equation is,

To factorize the above polynomial equation, make the groups, by taking out the greatest common factor.

Hence, the equation which shows the one way to determine the factors of provided equation by grouping is,

Learn more about factor of polynomial here;
brainly.com/question/24380382
Bobby has 24 pizza slices
he divided them among his friends and each friend got 3 pieces
how many friends did he have
so
24 divided by number of friends=3
24/y=3
multiply both sides by y
24y/y=3y
24 times y/y=3y
24 times 1=3y
24=3y
divide both sides by 3
24/3=3y/3
8=3/3y
8=1y
y=8
8 friends
Solve for y by simplifying both sides of the equation, then isolating the variable.
y = 7x/2 - 3