Step-by-step explanation:
Average mean = (q1 + q2 + q3)/3.
Answer:
(60.382 ; 83.998)
Step-by-step explanation:
The confidence interval is given as :
Mean ± Margin of error
Mean = 72.19
The margin of error is : Tcritical * s/√n
n = 13 ; s = 15.88
Tcritical at 98%, df = 13-1 = 12 = 2.681
Margin of Error = 2.681 * 15.88/√13 = 11.808
Confidence interval = 72.19 ± 11.808
(60.382 ; 83.998)
Easily you can try each formula with x=-2
because we know f(-2)=-1
So ,in this way D is correct Only!!
Answer:
150º and 30º angles.
Step-by-step explanation:
When you have parallel lines that are vut by a transversal line, you get a 2 pairs of 4 angles, this pairs are congruent or suplementary, this means that the sum of their angles is 180º or they are equal. So ig you have that one angle is 150º the other one since is suplementary must be 30º, since 150*30=180, and all of the angles are equal to these two, 150º and 30º angles.
Answer:
see explanation
Step-by-step explanation:
the equation of a circle centred at the origin is
x² + y² = r² ( r is the radius )
(1)
x² + y² = 196 ← is in this form
with centre = (0, 0 ) and r = = 14
(2)
x² + y² = 100 ← is in this form
with centre = (0, 0 ) and r = = 10