Answer:
21-2x
Step-by-step explanation:
11-2(x-5)
11-2x+10
21-2x
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3. A=bh/2
2A=bh
h=2A/b.
8. Dy-Cx=E
Dy=E+Cx
y=(E+Cx)/D
Answer:3/4
Step-by-step explanation:
if you divide 21 by 28 you get 3/4
The first equation is 
(Equation 1)
The second equation is
(Equation 2)
Putting the value of x from equation 1 in equation 2.
we get,


by simplifying the given equation,


Using discriminant formula,


Now the formula for solution 'x' of quadratic equation is given by:


Hence, these are the required solutions.
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