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MArishka [77]
3 years ago
9

Can anyone help me!! You don’t have to answer all just one would be fine!

Mathematics
1 answer:
netineya [11]3 years ago
5 0

Answer:

3. SinD= 12/15; Sin E= 9/15

4. sinD= 35/37; sinE= 12/37

5. sinD= 28/53; sinE= 45/53

6. Because the numerator should be 12 since that is the side opposite to the angle A.

Step-by-step explanation:

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matrenka [14]

Q=3x^2+5x-2\\R=2-x^2\\S=2x+5\\\\Q-[R+S]=(3x^2+5x-2)-[(2-x^2)+(2x+5)]\\\\=(3x^2+5x-2)-(2-x^2+2x+5)\\\\=(3x^2+5x-2)-[-x^2+2x+(2+5)]\\\\=(3x^2+5x-2)-(-x^2+2x+7)\\\\=3x^2+5x-2-(-x^2)-2x-7\\\\=3x^2+5x-2+x^2-2x-7\\\\=(3x^2+x^2)+(5x-2x)+(-2-7)\\\\=\boxed{4x^2+3x-9}

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Lerok [7]

Answer:

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Step-by-step explanation:

if you explain better i will gladly answer your question

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8 0
3 years ago
Write words to match the expression 3+(4×12)
Airida [17]
3 more than the produce of 12 and 4.
3 0
3 years ago
Read 2 more answers
Help please and thaank you
finlep [7]

Last one D

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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
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