3 years ago

Show ALL working

Mathematics

1 answer:

lisabon 2012 [21]3 years ago

3 0

Answer:

120

Step-by-step explanation:

2/5x=48

Divide 48 by 2/5

x= 48 × 5/2

x= 120

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-78

Step-by-step explanation:

substitute x as 10

so then you get

(-8) (10) + 2

then simplify

-80+2 = -78

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Need help with a math question

Mekhanik [1.2K]

Answer:

$z =3\sqrt{13}$

Step-by-step explanation:

In the figure you can identify up to 3 straight triangles.

To solve the problem, write the Pythagorean theorem for each triangle.

Triangle 1

$13^2 = z^2 + x^2$

Triangle 2

$z^2 = y^2 + 9^2$

Triangle 3

$x^2 = y^2 + 4^2$

Now substitute equation 2 and equation 3 in equation 1 and solve for y.

$13^2 = y^2 + 9^2 + y^2 + 4^2$

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$169 = 2y^2 + 81 + 16$

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$y^2 =36$

$y =6$

substitute the value of y in the second equation and solve for z

$z^2 = 6^2 + 9^2$

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$z = \sqrt{117}$

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3 years ago

What is the sum of sqrt 18 plus sqrt 72

Tanzania [10]

18=2*3*3=2*3²
72=2*2*2*3*3=2³ *3²

√18+√72=√(2*3²) +√(2³ * 3²)=3√2 + 3*2√2=3√2 + 6√2=9√2

Answer: √18+√72=9√2

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3 years ago