Please help!

The usual toll charge over the bridge is $1.50. If you purchase a special sticker for $10.50, the charge is only $0.80. At least how many trips over the bridge are needed before the sticker would cost less than the toll charge?

Find all sets of three consecutive positive odd integers whose sum is less than 22.

Anne’s scores on her first two tests in Algebra were 82 and 77. What will she need to make on third test to have an average of at least 85?

Question

Please help! 

The usual toll charge over the bridge is $1.50.  If you purchase a special sticker for $10.50, the charge is only $0.80.  At least how many trips over the bridge are needed before the sticker would cost less than the toll charge? 

Find all sets of three consecutive positive odd integers whose sum is less than 22. 

Anne’s scores on her first two tests in Algebra were 82 and 77.  What will she need to make on third test to have an average of at least 85?