Scores on a college entrance exam rose from 20.9 in 1977 to 21.5 in 1986. what percent increase is this?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents