How to convert a number to scientific notation on a ti-84?

Jamie went to home depot. she bought 25 bags of soil that cost $9 per bag. she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each. she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.