In a crayon box there are 5 dark colors every 8 light colors. is there are 20 dark colors, how many light colors are there?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =