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MrRissso [65]
3 years ago
6

Helppp!!!!

Mathematics
2 answers:
taurus [48]3 years ago
8 0

Answer:

djbvjukdfxch

Step-by-step explanation:

A

ArbitrLikvidat [17]3 years ago
3 0

Answer:

A. 47°

Step-by-step explanation:

ΔABC is an isosceles triangles as shown in the picture with two congruent (equal) sides.  When the sides are congruent, then the corresponding angles are also congruent.  Since ∠A = 4x + 7 and ∠B = 5x - 3, these two expressions are equal to each other:

4x + 7 = 5x - 3

Add 3 to both sides: 4x + 7 + 3 = 5x - 3 + 3 or 4x + 10 = 5x

Subtract 4x from both sides: 4x + 10 - 4x = 5x - 4x or 10 = x

Since x = 10, solve for m∠B: 5(10) - 3 = 50 - 3 = 47°

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