The acceleration of the bookshelf is equal to 1.30 
<u>Given the following data:</u>
- Mass of bookshelf = 51.5 kilogram
To determine the acceleration of the bookshelf, we would apply Newton's Second Law of Motion:
Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on the object while being inversely proportional to its mass.
Mathematically, Newton's Second Law of Motion is given by this formula;

Substituting the given parameters into the formula, we have;

Acceleration = 1.30 
Read more on net force here: brainly.com/question/1121817
Answer:
first one = 15x+30y-220
second one = 2.4x-4.4
Step-by-step explanation:
Hey there,
It take 45 min to complete 75% of the wall
1% = 45 / 75
= 0.6
100 % = 0.6 x 100
= 60 min
It takes her 60 mins or 1 hour to finish building the wall.
Hope this helps :))
~Top♥
<h3>f(x) is equal to 4.5 when x = 1/2</h3>
<em><u>Solution:</u></em>
Given that,

We have to find f(x) when x = 1/2
We can solve by substituting x = 1/2 in given function

Thus f(x) is equal to 4.5 when x = 1/2