Answer:

Step-by-step explanation:

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Answer:
a = 3
Step-by-step explanation:
Evaluating the given function at the point, we have ...
f(-1) = a(-1)^2 +1 = 4
a +1 = 4
a = 3
The value of 'a' is 3.
Answer:
x = 2.7
Step-by-step explanation:
-1.2x + 11.45 = 8.21
Subtract 11.45 from both sides to get -1.2x = -3.24.
Divide both sides by -1.2 to get x = 2.7.
Answer:
z = -7.5
Step-by-step explanation:
3.5z -2.7z = -6
Combine like terms
.8z = -6
Divide each side by .8
.8z/.8 = -6/.8
z = -7.5