Which of the following expressions are equivalent to 7.2÷ −8.1 ÷ -3.7?

a)−7.2÷ −8.1÷ −3.7
b)−7.2÷ 8.1÷ 3.7
c)none of the above

What is the measure of angle tvu shown in the diagram below

How many real-number solutions does the equation have? -4x^2 + 10x + 6 = 0 a. no solutions b. two solutions c. infinitely many solutions d. one solution

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.