The p-value falls between 0.025 and 0.05 is my guess, since we have t = -1.45 in 25 observations. The test of H0 against Ha show that μ = 7.2 and μ < 7.2 means μ = μ (7.2 = 7.2).
∆= b^2 - 4ac
where b= -2
a=1
c=2
therefore: 2^2 - 4 x 1 x 2
= 4 - 4 x 2
= 4 - 8
= -4
Just good ole algebraic manipulation

First, Let's Combine Common Terms
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Now Let's Divide
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Let's Simplify That Fraction
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Answer
Y=-4+3x is different because all others have a negative 4 AND a -3x
4*5=20
8*(7-4)=24
20+24=44
The trick is to make the figure into two