Why did northern politics support higher tariffs

Why did Northerners want higher tariffs?

By 1828, foreign manufactured goods faced high import taxes. ... Because importation was often cheaper than shipping from the North, the South paid most of the federal tariffs. Much of the tariff revenue collected from Southern consumers was used to build railroads and canals in the North.

The higher tariffs protected Northern manufacturers from foreign competition.

Explanation:

Hope this helps somebody

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69