Petra records the score in each test she takes.

The mean of the first n scores is x.
The mean of the first (n-1) scores is (x+1).

Find the nth score in terms of n and x. Give your answer in its simplest form.

Step-by-step explanation:

Given the mean of terms as , and of as :

We know that   for terms.

Therefore for terms;

For  terms;

To find the nth score, we subtract the sum of (n-1) terms from the sum of n terms:

term=

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !

answer: sine

step-by-step explanation: