No he did not because 20% of 250 is 50 and there are 90 students not 50 students!! Hope this helped you a lot !!!
Answer: 81
Step-by-step explanation:
Mean of four nos = 85
Score = 85 x 4 = 340
Deduct 97 from 340 = 243
Mean of three nos. 243/3 = 81
D because you have to use absolute value to solve.
Answer:
Hello! :) have a good day!
2x + 12
Note that

and

.
From the unit circle, we can check that

and

have the same value, but opposite signs, that is:

.
Thus,

.
Note that

is the x-coordinate of the lowest point on the unit circle, that is (0, -1). Thus

Answer: 0