Mai was training for the 400-meter race. Mai had a personal record of 63.36 seconds. In a practice event, she had a time
of 63.89 seconds. Which value is a reasonable estimate of the
difference between Mai's record time and her practice time?

a. 0.05 s
b. 1.15 s
c. 1.5 s
d. 0.5 s

For what values of b will f(x)= logbx be a decreasing function? (16 )

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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.