If isosceles triangle ABC has a 130° angle at vertex B, which statement must be true? A) m∠A = 15° and m∠C = 35°
B) m∠A + m∠B = 155°
D) m∠A + m∠C = 60°
C)m∠A = 20° and m∠C = 30°

Ireally need ! if a musician uses his credit card to pay for a new violin that costs $2,900 and does not pay on it until the second month, what will the 3.35% monthly interest charge be at the end of the first month? show your work or explain how you got your answer.