First line because 4(2a+1)=8a+4 and 9a+4-(8a+4)= a
Second line because a times 2 =2a and 2a+1-2a=1
<span>Although the second equality is more or less obvious since 2a+1 leaves a remainder of 1 when divided by a.</span>
Answer: 
Step-by-step explanation:
For this exercise you need to remember that a Square is defined as a Quadrilateral whose sides are equal in lenght and all its interios angles measure 90 degrees.
Based on that definition, and observing the squarE given in the picture attached, you can write the following equation:

Then, you need to solve for the variable "x" in order to find its value. You get that this is:

Now, knowing the value of "x" you can susbstitute it into any expression that represents the side of the square, and then you must evaluate in order to find the lenght of the side.
You get:

So the garden has a rectangular shape, of 23 m of length, x meters of width and 851 m^2 area, the area is calculated with this formula:
area = length*width
lets solve for width:
width = area/length
if we substitute our data we have:
width = 851/23
width = 37
therefore the width of the garden is 37 m
Answer:

Step-by-step explanation:
-64 would be the whole number.
.875 would be 875/1000 as a fraction.
Put them together:

Simplify:

Answer: (-1/6)/(3/7)= - 7/18
Solution:
(-1/6)/(3/7)=-(1/6)(7/3)=-[(1)(7)]/[(6)(3)]=-7/18