Melanie is taking flute lessons. her flute teacher charges $32.50 per hour. if melanie has 2.5 hours of lessons each week, what is the weekly charge for her lessons?

Landon wrote that 3−2.6=4. which statement about his answer is true?

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?