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D) 2.1+2x=7.5
All the sides added together will equal the perimeter
Using the definition of vertical angles, the value of z is: 15.
<h3>Vertical Angles Pair</h3>
The two pairs of opposite angles formed when two straight lines intersect are called vertical angles, and are therefore congruent to each other.
Thus:
2z + 10 = 40
2z = 40 - 10
2z = 30
z = 30/2
z = 15
Therefore, using the definition of vertical angles, the value of z is: 15.
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The simplified form of the equation is
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Given that</h2>
Equation; 
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We have to determine</h3>
The simplified form of the equation;
<h3>According to the question</h3>
To determine the simplified form of the equation following all the steps given below.
Equation; 
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To simplify the equation multiple the terms and solve.</h3>
Then,
The simplified form of the equation is,

Hence, The simplified form of the equation is
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800(1+7)∧4
it will be $1048.63