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Sholpan [36]
3 years ago
5

Please help me with this

Mathematics
1 answer:
den301095 [7]3 years ago
4 0

Answer:

i think the final awnser is 453

Step-by-step explanation:

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Find the result when 5 + 2 is subtracted from 9.
Kamila [148]

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Step-by-step explanation:

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What is the digit in 913 and where's the digit in the tens place and the value of the digit tens someone answer for my homework
lorasvet [3.4K]
4. Period with the digits 913 is called thousands period.
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X, Y and Z form the vertices of a triangle. XY = 12.4m, XZ = 10.4m and YZ = 8.7m. Find the angle ∠ YXZ rounded to 1 DP.
sweet-ann [11.9K]

Answer:

43.8°

Step-by-step explanation:

Applying,

Cosine rule,

From the diagram attached,

x² = y²+z²-2yxcos∅.................... Equation 1

where ∅ = ∠YXZ

Given: x = 8.7 m, y = 10.4 m, z = 12.4 m

Substitute these values  into equation 1

8.7² = 10.4²+12.4²-[2×10.4×12.4cos∅]

75.69 = (108.16+153.76)-(257.92cos∅)

75.69 = 261.92-257.92cos∅

collect like terms

257.92cos∅ = 261.92-75.69

257.92cos∅ = 186.23

Divide both sides by the coefficient of cos∅

cos∅ = 186.23/257.92

cos∅ = 0.722

Find the cos⁻¹ of both side.

∅ = cos⁻¹(0.7220)

∅ = 43.78°

∅ = 43.8°

6 0
3 years ago
If N = f(x) and f(x) = 3x^2 −x−5
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