Please help. I know it’s not the hardest, but I think I did something wrong when I solved it. Please include your work. Tysm! Pl
ease solve only number 27!
2 answers:
1 Multiply both sides by
n
−
3.2
n−3.2.
n
+
0.3
=
9
2
(
n
−
3.2
)
n+0.3=
2
9
(n−3.2)
2 Simplify
9
2
(
n
−
3.2
)
2
9
(n−3.2) to
9
(
n
−
3.2
)
2
2
9(n−3.2)
.
n
+
0.3
=
9
(
n
−
3.2
)
2
n+0.3=
2
9(n−3.2)
3 Multiply both sides by
2
2.
2
n
+
0.6
=
9
(
n
−
3.2
)
2n+0.6=9(n−3.2)
4 Expand.
2
n
+
0.6
=
9
n
−
28.8
2n+0.6=9n−28.8
5 Subtract
2
n
2n from both sides.
0.6
=
9
n
−
28.8
−
2
n
0.6=9n−28.8−2n
6 Simplify
9
n
−
28.8
−
2
n
9n−28.8−2n to
7
n
−
28.8
7n−28.8.
0.6
=
7
n
−
28.8
0.6=7n−28.8
7 Add
28.8
28.8 to both sides.
0.6
+
28.8
=
7
n
0.6+28.8=7n
8 Simplify
0.6
+
28.8
0.6+28.8 to
29.4
29.4.
29.4
=
7
n
29.4=7n
9 Divide both sides by
7
7.
29.4
7
=
n
7
29.4
=n
10 Simplify
29.4
7
7
29.4
to
4.2
4.2.
4.2
=
n
4.2=n
11 Switch sides.
n
=
4.2
n=4.2
Answer:
4.2 (to 1d.p.)
Step-by-step explanation:
=9/2 9/2 = 4.5
Multiply both sides by (n-3.2)
n+0.3 = 4.5(n-3.2)
Now expand the brackets
n+0.3 = 4.5n - 14.625n
Now rearrange to make n the subject
n + 0.3 = 4.5n -14.625
-n -n
4.5n - n -14.625 = 0.3
3.5n -14.625 = 0.3
+14.625 +14.625
3.5n = 14.925
÷3.5 ÷3.5
n = 4.2
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