X2 + 4x + 8 = 0
Select one:
A. {0, -4}
B. {2 ± 2i}
C. {-2 ± 2}
D. {-2 ± 2i}

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.

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry