Answer:
x
=
7
9
.
Step-by-step explanation:
x
=
7
9
.
Explanation:
Remember the rules of logarithms:
log
a
−
log
b
=
log
(
a
b
)
. Using this, we get
log
x
−
log
(
x
+
7
)
=
−
1
⇒
log
(
x
x
+
7
)
=
−
1
Now we remember that
log
c
=
d
⇔
c
=
10
d
. Essentially what we're doing there is taking 10 to the power of both sides, and since
10
x
and
log
x
are inverse functions, they cancel off.
f
−
1
[
f
(
x
)
]
=
x
. So we get
log
(
x
x
+
7
)
=
−
1
(
⇒
10
log
(
x
x
+
7
)
=
10
−
1
)
⇒
x
x
+
7
=
10
−
1
⇒
x
=
x
+
7
10
⇒
10
x
=
x
+
7
⇒
9
x
=
7
⇒
x
=
7
9
So
x
=
7
/
9
is our answer.
Answer:no se la verdad
Step-by-step explanation:
To find the answer you will write and equation in terms of the cost of a bag of chips.
3(cost of milk) + 4 (cost of water) + 8 (cost of bag of chips) = $21.30
3 (2c +1.60) + 4 (2c) + 8 (c) = $21.30 ; Simplify
6c + 4.80 + 8c + 8c = 21.30
22c + 4.80 = 21.30
- 4.80 -4.80
<u>22c </u> = <u>$16.50</u>
22 22
c = 0.75
The chips cost $0.75 each.
The milk costs (2 x $0.75 + $1.60) $3.10 each.
The water costs (2 x $0.75) $1.50 each.
On the right side, there are
• 2•2 = 4 atoms of Nb
• 2•5 = 10 atoms of O
so among the reactants on the left, the reaction is balanced as
4 Nb + 5 O₂ → 2 Nb₂O₅
