(xy)² - x + y
= (2*4)² - 2 + 4
= 8² + 2
= 64 + 2
= 66
(9x - 3y)²
= (9*2 - 3*4)²
= (18 - 12)²
= 6²
= 36
Answer:
4
Step-by-step explanation:
40-36=4
Yes I think it is correct
Answer:
416
Step-by-step explanation:
Standard deviation is 2.6
Margin error for the problem is 0.25
Probability 95%, that means thet the siginficance level α is 1 – p
α = 1 – 0.95 = 0.05
margin of error (ME) can be defined as follows
ME = Z(α/2) * standard deviation/ √n
Where n is the sample size
Z(0.05/2) = Z(0.025)
Using a z table Z = 1.96
Now, replacing in the equation and find n
.25 = 1.96 * 2.6/ √n
0.25 = 5.096/√n
√n = 5.096 /0.25
√n = 20.38
n = 20.38^2
n = 415.5 = 416
Answer:
-1, -3, -5
Step-by-step explanation: