#3
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Answer: 16
I’m not able to see the question on the bottom.
Since an arithmetic sequence is a sequence of numbers and the difference of any two successive members of the sequence is a constant
So this question is arithmetic because it keep minus by 7
from 19 - 7 = 12
12 - 7 = 5
5 - 7 = -2
so common difference is -7
or you can check with arithmetic formular as
=
+ (n−1)d
I will just put in the 4th term which is -2 and n will equal to 4
and
is the 1st term which is 19
-2 = 19 + (4−1)d
-2 - 19 = 3d
d = 
d = -7
ANSWER
The discriminant is -3
EXPLANATION
The given quadratic equation is:

Comparing this equation to:

we have
a=1, b=3, and c=-6
The discriminant is calculated using the formula,

We substitute the values to get:


