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otez555 [7]
3 years ago
7

Could someone help me with these questions. I know I have some answers for them but I got them wrong so I need help to get the r

ight answet

Mathematics
2 answers:
Salsk061 [2.6K]3 years ago
7 0
Using external angle theorme

3x-20=110+x
2x-20=110
2x=130
x=65
Vera_Pavlovna [14]3 years ago
6 0
I am not quite sure but I hope it helps!

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ivolga24 [154]

Answer:

b = 10

Step-by-step explanation:

The area (A) of a triangle is calculated as

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Here h = 3x + 15 and A = 15x + 75, thus

\frac{1}{2} × b × (3x + 15) = 15x + 75

Multiply both sides by 2 to clear the fraction

b(3x + 15) = 30x + 150

Divide both sides by (3x + 15)

b = \frac{30x+150}{3x+15} ← factor numerator and denominator

  = \frac{30(x + 5)}{3(x+5)} ← cancel the factor (x + 5) on numerator/denominator

  = \frac{30}{3}

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