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zzz [600]
2 years ago
7

Answers : A:6.6 B:7.2 C:7.8 D8.1

Mathematics
1 answer:
OLga [1]2 years ago
8 0

Answer:

approx 7.81 Exactly: √61

Step-by-step explanation:

Use Pythag theorem: 5^2 + 6^2 = hyp^2 (line AS)

25 + 36 = 61

hyp = √61 or about 7.81

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Please teach me on how to answer this question. (addmath question)
arsen [322]

We know that \overline{x}=8 so:

\overline{x}=8\\\\\\\dfrac{\sum\limits_{k=1}^7\,x_k}{7}=8\qquad|\cdot7\\\\\\ \boxed{\sum\limits_{k=1}^7\,x_k=56}

We want to calculate:

\sum\limits_{k=1}^7\,\big(2x_k-3\big)^2=\sum\limits_{k=1}^7\,\big(4x_k^2-12x_k+9\big)=\\\\\\=\sum\limits_{k=1}^7\,4x_k^2-\sum\limits_{k=1}^7\,\big12x_k+\sum\limits_{k=1}^7\,9=4\sum\limits_{k=1}^7\,x_k^2-12\sum\limits_{k=1}^7\,x_k+\sum\limits_{k=1}^7\,9=\\\\\\=4\cdot672-12\cdot56+7\cdot9=2688-672+63=\boxed{2079}

5 0
3 years ago
HELPPPPPP PLEASe!!!!!!!!
olga nikolaevna [1]

Answer:

Cos x

Step-by-step explanation:

7 0
3 years ago
Parallelly lines/angle problem
rodikova [14]

Answer:

142 degrees

Step-by-step explanation:

4 0
2 years ago
Show that the relation R consisting of all pairs(x, y)such that x and y are bit strings of length three or more that agree in th
Mice21 [21]

Answer:

See proof below

Step-by-step explanation:

An equivalence relation R satisfies

  • Reflexivity: for all x on the underlying set in which R is defined, (x,x)∈R, or xRx.
  • Symmetry: For all x,y, if xRy then yRx.
  • Transitivity: For all x,y,z, If xRy and yRz then xRz.

Let's check these properties: Let x,y,z be bit strings of length three or more

The first 3 bits of x are, of course, the same 3 bits of x, hence xRx.

If xRy, then then the 1st, 2nd and 3rd bits of x are the 1st, 2nd and 3rd bits of y respectively. Then y agrees with x on its first third bits (by symmetry of equality), hence yRx.

If xRy and yRz, x agrees with y on its first 3 bits and y agrees with z in its first 3 bits. Therefore x agrees with z in its first 3 bits (by transitivity of equality), hence xRz.

5 0
3 years ago
Can you guys help me please :(
Andrei [34K]

Answer:

circumference formula = πd or 2πr .. they are the same thing

G is the answer

6 0
2 years ago
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