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dndndndnxmnc
23.02.2020 •
Mathematics
Given that y varies directly as x and inversely as 2m-1 and that y =5 when x=7and m=4, calculate of variation k
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Ответ:
y
=
k
x
k
=
y
.
x
where
k
is the constant
x
=
7
and
y
=
10
so ,
k
=
7
×
10
=
70
Now, we have the value of
k
and
x
=
10
, substituting these in the variation to find
y
k
=
y
.
x
y
=
k
x
y
=
70
10
=
7
on observing the values
when
x
=
7
,
y
=
10
, and
when
x
=
10
,
y
=
3
as the value of
x
decreases
y
increases and vice verse as they vary inversely.
Ответ:
Area = 24 cm²
Step-by-step explanation:
Area = 0.5 x (base x height)
Area = 0.5 x (6 x 8)
Area = 0.5 x 48
Area = 24 cm²