Fran receives $113 per year in simple interest from investing $1300. Part is invested at 7%, part at 8% and part at 9%. There is $800 more invested at 9% than at 8%. Find the amount invested at each rate.
The amount invested at 7% is $

Find the value of the cosine for angle a

In which form is the following function written? y = - 2(x – 3)(x + 5)

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.