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siniylev [52]
3 years ago
14

Help with radicals, questions down in attachments.

Mathematics
1 answer:
Makovka662 [10]3 years ago
8 0
We can't solve first 2 because of missing diagramd
but, longest side=hypotonuse=c
other 2 sides=legs=a and b
a^2+b^2=c^2
\sqrt{a^{2}+b^{2}}=c

last 2
1.
remember that
longest side<sum of other 2 sides or else you can't make a traignel
5+7=12
12<13
13 is longest side
13<12 is false
therefor it is false that it is a triangle
not a triangle


2.
\sqrt{ \frac{x}{y} } = \frac{ \sqrt{x} }{ \sqrt{y} } so
\sqrt{ \frac{20}{7} } = \frac{ \sqrt{20} }{ \sqrt{7} } =\frac{4\sqrt{5} }{\sqrt{7} }
rationalize denomeator by multplying by \frac{ \sqrt{7} }{ \sqrt{7} }

\frac{4\sqrt{35} }{7}





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write a system of linear equations that has only one solution. solve the system of equations in two ways.
Iteru [2.4K]
X + 5y = 1 . . . . (1)
8x - 2y = 3 . . . .(2)
Solution 1.
From (1), x = 1 - 5y
substituting for x in (2), we have:
8(1 - 5y) - 2y = 3
8 - 40y - 2y = 3
8 - 42y = 3
42y = 5
y = 5/42
x = 1 - 5(5/42) = 1 - 25/42 = 17/42.

Solution 2.
Multiply (1) by 8, to get:
8x + 40y = 8 . . . . . (3)
(3) - (2) = 40y - (-2y) = 8 - 3
42y = 5
y = 5/42
substitute for y into (3), to get:
8x + 40(5/42) = 8
8x + 100/21 = 8
8x = 8 - 100/21 = 68/21
x = (68/21)/8 = 17/42
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3 years ago
Plz show work and answer thx u will get 100 points and make sure it's right
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2 years ago
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