(a)
Find the volume, in terms of x , of each of three level of platform.
The volume of the bottom platform is given by 48x3 .
The volume of the middle platform is given by 24x3 .
The volume of the upper platform is given by 8x3 .
Given:
Calculation:
The length, width and height of the bottom platform are 8x,6x,x respectively.
The length, width and height of the middle platform are 6x,4x,x respectively.
The length, width and height of the upper platform are 4x,2x,x respectively.
Therefore,
The volume of the bottom platform is given by 8x⋅6x⋅x = 48x3 .
The volume of the middle platform is given by 6x⋅4x⋅x = 24x3 .
The volume of the upper platform is given by 4x⋅2x⋅x = 8x3 .
(b)
Write an equation for the total volume.
48x3+24x3+8x3=1250
Given:
The total volume is given by 1250 cubic feet.
Calculation:
The length, width and height of the bottom platform are 8x,6x,x respectively.
The length, width and height of the middle platform are 6x,4x,x respectively.
The length, width and height of the upper platform are 4x,2x,x respectively.
Therefore,
The volume of the bottom platform is given by 8x⋅6x⋅x = 48x3 .
The volume of the middle platform is given by 6x⋅4x⋅x = 24x3 .
The volume of the upper platform is given by 4x⋅2x⋅x = 8x3 .
Total volume is given as 1250 cubic feet.
Hence, the equation for the total volume is given by
48x3+24x3+8x3=1250
(c)
Solve the equation 48x3+24x3+8x3=1250 and then find the dimensions of the three levels of platform.
The length, width and height of the bottom platform are given by 20feet,15feet,2.5feet .
The length, width and height of the middle platform are 15feet,10feet,2.5feet .
The length, width and height of the upper platform are =10feet,5feet,2.5feet .
Given:
48x3+24x3+8x3=1250
The total volume is given by 1250 cubic feet.
Calculation:
The equation for the total volume is given by
48x3+24x3+8x3=1250
Solve this equation
80x3=1250
x3=1258
x=52=2.5 .
Therefore,
The length, width and height of the bottom platform are given by
8⋅2.5,6⋅2.5,2.5
=20feet,15feet,2.5feet
The length, width and height of the middle platform are
6⋅2.5,4⋅2.5,2.5
=15feet,10feet,2.5feet
The length, width and height of the upper platform are
4⋅2.5,2⋅2.5,2.5
=10feet,5feet,2.5feet
Chapter 2 Solutions
Holt Mcdougal Larson Algebra 2: Student Edition 2012
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