Factor $80 c^{2} + 30 c$.
Answer:
Expand the product $\left(- 10 b + 7\right) \left(6 b + 10\right)$.
Expand the product $\left(2 v + 5\right) \left(4 v + 5\right)$.
Simplify $4 t(7 t + 11) +0(- 10 t - 7)$.