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2 years ago

I need help on this

Mathematics

2 answers:

Lena [83]2 years ago

3 0

Answer:

X=3.5

Step-by-step explanation:

AD = 4+3 = 7
ED = X
that is the ADE triangle

AB= 4
CB = 2
this is the ABC triangle
because the A angle shares the same triangles
ED /CB = AD/ AB
X/2 = 7/4
by multiplying all of the equation by 2 to get rid of the 2 under the x

X= 7/2 which is 3.5
so X= 3.5

MArishka [77]2 years ago

3 0

Step-by-step explanation:

ABC and ADE are similar triangles.

that means they have the same angles, and all side lengths of one triangle correlate to the side lengths of the corresponding sides in the other triangle with the same factor.

so, know the factor of one pair of corresponding sides, you know the factor for the other sides too.

therefore, ED (x) relates to BC (2) with the same factor, as AD (4+3) to AB (4).

x/2 = (4+3)/4 = 7/4

x = 2×7/4 = 7/2

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3 years ago

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3 years ago

S^2-17s-60=(s-5)(s-12) What would be wrong about this equation? What is the correct version?

Sedbober [7]

The answer is -60=60

Simplifying
s2 + -17s + -60 = (s + -5)(s + -12)

Reorder the terms:
-60 + -17s + s2 = (s + -5)(s + -12)

Reorder the terms:
-60 + -17s + s2 = (-5 + s)(s + -12)

Reorder the terms:
-60 + -17s + s2 = (-5 + s)(-12 + s)

Multiply (-5 + s) * (-12 + s)
-60 + -17s + s2 = (-5(-12 + s) + s(-12 + s))
-60 + -17s + s2 = ((-12 * -5 + s * -5) + s(-12 + s))
-60 + -17s + s2 = ((60 + -5s) + s(-12 + s))
-60 + -17s + s2 = (60 + -5s + (-12 * s + s * s))
-60 + -17s + s2 = (60 + -5s + (-12s + s2))

Combine like terms: -5s + -12s = -17s
-60 + -17s + s2 = (60 + -17s + s2)

Add '17s' to each side of the equation.
-60 + -17s + 17s + s2 = 60 + -17s + 17s + s2

Combine like terms: -17s + 17s = 0
-60 + 0 + s2 = 60 + -17s + 17s + s2
-60 + s2 = 60 + -17s + 17s + s2

Combine like terms: -17s + 17s = 0
-60 + s2 = 60 + 0 + s2
-60 + s2 = 60 + s2

Add '-1s2' to each side of the equation.
-60 + s2 + -1s2 = 60 + s2 + -1s2

Combine like terms: s2 + -1s2 = 0
-60 + 0 = 60 + s2 + -1s2
-60 = 60 + s2 + -1s2

Combine like terms: s2 + -1s2 = 0
-60 = 60 + 0
-60 = 60

Solving
-60 = 60

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