Answer:
Z = -1.60
it is low ... it appears that for this problem 2 standard deviations below must be reached to be considered "unusual"
Step-by-step explanation:
Rationalize the denominator of b. So, multiply the numerator and denominator by
Now, find a +b
Combine like terms
Now find (a + b)²
(a +b)² =
Hint:
c
2x + 2y = -2
3x - 2y = 12
5x = 10
x = 2
2(2) + 2y = -2
4 + 2y = -2
2y = -6
y = -3
(2, -3)