Answer:
Y = X^2 -4X +9
Step-by-step explanation:
It is convenient to write T in terms of X.
X = T +2
T = X -2
Then this can be substituted into the equation for Y.
Y = T^2 +5
Y = (X -2)^2 +5 = X^2 -4X +4 +5
40%
(21-15)/15=0.4
0.4×100=40
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