Answer:
7x2 + 3y2 - 4x
Step-by-step explanation:
The margin of error of a sample is given by:
B = z(α/2) σ/√n; where B is the margin of error = 25, z(α/2) is the level of significant = 1.96, σ is the standard deviation = 100 and n is the sample size.
25 = 1.96(100/√n)
100/√n = 25/1.96 = 12.76
√n = 100/12.76 = 7.84
n = (7.84)^2 = 61.47
Therefore, the smallest sample size required is 62 seniors.
Answer:
x = 183
Step-by-step explanation:
(x -73)° + x° +67° = 360°
x-73+ x +67 = 360
x + x -73 +67 = 360
2x-6 = 360
2x = 360+6
x = 366÷2
x = 183
Check:
(183 - 73) = 110° , x = 183° , 67°
110° + 183° + 67° = 360°
