See attachment for answer:
The axis of symmetry is x=t where t is a constant
for f(x)=ax²+bx+c, the value of t is

so given
f(x)=2x²+4x+2
a=2
b=4
so t is

or

or -1
the axis of symmetry is x=-1
<h3>
Answer:</h3>
A,C and G are <u>not quadratic equations</u> where as E is a quadratic equation.(Though C could be a quadratic equation).
<h3>
Step-by-step explanation:</h3>
C could be a quadratic equation if you transpose 5 to LHS.
A is not a proper equation because x is not present in it and G is not a quadratic equation but it's linear equation.
Hope it helps you.
Answer:
this is a left tailed test
Null hypothesis,
σ = 40 seconds
Alternate hypothesis,
σ < 40 seconds.
Step-by-step explanation:
i) the standard deviation of duration times in seconds of the old faithful geyser is less than 40 sec. identify the null hypothesis and alternative hypothesis in symbolic form
ii) this is a left tailed test
Null hypothesis,
σ = 40 seconds
Alternate hypothesis,
σ < 40 seconds.