<em> a₁ is the first term, d is the difference, and n is the term</em>
a₁ = -5
d = -5

<em>explicit formula</em>
<em>recursive formula</em>
Answer: the baby weighs 16.5 pounds
Supplementary means adds to 180
A+B=180
B=73
A+73=180
minus 73 both sides
A+73-73=180-73
A+0=107
A=107
A=107 degrees