Which expression is equivalent to 7 to the 3rd power times 7 to the negative 5th power, 7 to the 2nd power, 7 to the 7th power, 1 over 7 to the 2nd power or 1 over 7 to the 7rh power

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

Which of the following will form the composite function?

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.