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AfilCa [17]
3 years ago
13

What is the value of a? a = ?

Mathematics
2 answers:
Tatiana [17]3 years ago
6 0

Answer:

  a = 15

Step-by-step explanation:

The Pythagorean theorem applies:

  a² + 20² = 25²

  a² = 625 - 400 . . . . . subtract 20²

  a = √225 . . . . . . . . . . take the square root

  a = 15

_____

You might recognize that the given measures (20, 25) are in the ratio 4:5. There is only one right triangle with sides in that ratio: the 3:4:5 right triangle. That is, the unknown side (a) matches

  a : 20 : 25 = 3 : 4 : 5 . . . . numbers on the left are 5 times those on the right

  a = 5·3 = 15

Stella [2.4K]3 years ago
4 0
The correct answer is 15.
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3 years ago
A textile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 ki
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Answer

given,

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standard deviation = 0.5 Kg

assume the observed statistic is = 11.1

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assuming the number of sample = 4

n = 4

Hypothesis test:

H₀ : μ≥ 12

Ha : μ < 12

now,

significant level α = 0.05

z* = \dfrac{\bar{X}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

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Test statistics, Z* = -3.60

P-value

P(Z<-3.60) = 0.002 (from z- table)

P- value = 0.002

now,

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5 0
3 years ago
What is the square root was of 225
just olya [345]
The answer is 15 trust me.
8 0
3 years ago
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Solve the inequality. q - 1 1/3 &gt; -2 1/2
ioda

\Leftrightarrow q>1\frac{1}{6}

Step-by-step explanation:

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6 0
2 years ago
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Effectus [21]

Answer:

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∵ cos60 = GF/EF

∴ GF/EF = 1/2

∴ EF = 2 × GF ⇒ E

8 0
3 years ago
Read 2 more answers
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