ayoismeisjjjjuan
23.10.2019 •
Mathematics
Darren williams receives a monthly income of $600 from a pension and some from social security. his wife, laura, also receives a monthly income from social security, but only 70 percent of darren's amount. if their monthly income is $1,800 per month, how much is darren's monthly social security benefit?
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Ответ:
$705.88
Step-by-step explanation:
Let d represent Darren's monthly income from Social Security. Then 0.7d is the amount his wife receives. Their total monthly income is ...
600 + d + 0.7d = 1800
1.7d = 1200 . . . . . . . . . . . subtract 600, collect terms
d = 1200/1.7 = 705.88
Darren's monthly Social Security benefit is $705.88.
Ответ:
14
Step-by-step explanation:
k
=
c
−
b
2
4
a
We know that
a
=
1
,
b
=
−
8
and
c
=
2
, so let's substitute:
k
=
2
−
(
−
8
)
2
4
(
1
)
=
2
−
64
4
=
2
−
16
=
−
14
.
So, we have
min
=
−
14
. Let's check:
graph{(x^2 - 8x + 2 - y)(-14 -y)=0 [-11.82, 20.22, -15.38, 0.64]}