gvizabal
22.04.2020 •
Mathematics
A half-mile of road will be marked with a combination of yellow dashes that are 10 feet long and gaps that are 2 feet wide between dashes. How many yellow dashes must be painted on that part of the road?
Note: 1 mile = 5,280 feet.
660
220
264
1,320
Solved
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Ответ:
4
−34x
2
+225=0
2 Factor
x
4
−
34
x
2
+
225
x
4
−34x
2
+225.
(
x
2
−
25
)
(
x
2
−
9
)
=
0
(x
2
−25)(x
2
−9)=0
3 Solve for
x
x.
x
=
±
5
,
±
3
x=±5,±3