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FrozenT [24]
4 years ago
11

Help me please i wil be so thankfull.

Mathematics
1 answer:
kykrilka [37]4 years ago
4 0

Answer: 4in

Step-by-step explanation:

Diameter is the radius * 2. The radius is 2in. 2 * 2 = 4

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Two-fifths of a number is decreased by three. Find the value of the expression if the number is twenty-five.
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Let's take the number as x.

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I need to solve these two equations using either substitution or elimination
vitfil [10]

Answer:

y = -15

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Step-by-step explanation:

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1/4x - 1/2 = 5

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x - 2y = 20 (3)

9x + 2y = -120 (4)

Using elimination method, Add (3) and (4)

9x + x = -120 + 20

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x = -100/10

x = -10

Substitute x = -10 into (3)

x - 2y = 20 (3)

-10 - 2y = 20

-2y = 20 + 10

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y = 30/-2

y = -15

y = -15

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3 years ago
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zmey [24]
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3 years ago
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