When expressing the reciprocal of $1.67$ as a simplified fraction, what number do you get if you subtract the numerator from the denominator?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Someone answer asap for ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.