21. the values of x such f(x) < g(x):

22. The values of x such g(x) < 0:
Using the Pythagorean theorem
C = sqrt( 9^2 + 40^2)
C = sqrr(81 + 1600)
C = sqrt(1681)
C = 41 cm
X=the number
4x-1=11
If you wanted to solve it
4x-1=11
4x-1+1=11+1 add 1 on both sides
4x/4=12/4 divide 4 on both sides
x=3 solution
If that helps, but I'm pretty sure the answer is -1 that is what I have found in Google that is what all the answers are that in finding.