Which is a recursive formula for the sequence 99.4,0, -99.4, -198.8, where f(1)= 99.4? F(n+1)=f(n)-99.4, n > 1
F(n+1)=f(n)-99.4,n > 1
F(n+1)=99.4f(n), n > 1
F(n+1)=-99.4f(n), n > 1

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

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.

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9