Aboat can travel 12 km down the river in the same time it can go 4 km up the river. if the current in the river is 2 km per hour, how fast can the boat travel in still water?

i know the answer but i don't know the steps so good luck! and have fun with 100 points! ^-^

In a certain pentagon, the interior angles are a,b,c,d,e where a,b,c,d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

What is the value of f(x) = 2.2 for f(-2)?