How many eight-letter permutations can be formed from the first letters of the alphabet? '?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Vinny is interviewing for a job.he wants his take home pay to be at least $42,000.what is the least salary he can earn if he pays 25% income tax?