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lidiya [134]
4 years ago
9

BRAINLIEST. NEED HELP NOW!!! What is the value of x?

Mathematics
1 answer:
Arturiano [62]4 years ago
3 0

Answer:

x=10

Step-by-step explanation:

these are similar triangles

8             12

------   = -----------

x+4          2x+1


using cross products

8* (2x+1) = 12(x+4)

distribute

16x + 8 = 12x+48

subtract 12x from each side

16x-12x +8 = 12x-12x+48

4x+8 = 48

subtract 8 from each side

4x+8-8 = 48-8

4x = 40

divide by 4

4x/4 = 40/x

x =10

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8 0
3 years ago
Solve for d -10=-2+1/2d
larisa86 [58]

d=16

d-10-(-2+1/2*d)=0

simplify

(d-10)-(-2+(1/2*d))=0

rewrite as an equivalent fraction

(using 2 as the denominator)

-2=-2/1=-2*2/2

adding fractions with common denominator

-2*2+d/2=d=4/2

(d-10)-(d-4)/2=0

rewrite the whole as a fraction using 2 as your denominator

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d-16/2=0

get rid of the denominator

d=16/2*2=0*2

solve

d-16=0

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