Statistics:
a person's standardized test score on a test is given by the function z(x) = x-25/40, where x is the actual score on the test.
a) if the person's actual score was 600, what is the standardized score?
b) find the inverse of z(x)
c) using the inverse, if the person's standardized score was 2.5, what was the person's actual score on the test?

your work:
a)

b) step 1: switch the x & y
step 2: solve for y

c)

Step-by-step explanation:

a) sub in 600 for 6

600-25/40 =14.375

b) switch x and y

x=y-25/40

Solve for y

40x=y-25

y=40x+25

c)Plug in 2.5 for z(x)

2.5= x-25/40

100=x-25

x=125

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

25/6 hope it : )

step-by-step explanation: