mia3128
29.02.2020 •
Mathematics
The ages in years of employees at two different companies are shown below.
• Company A: 22, 30, 31, 36, 38, 46, 49, 52
• Company B: 48, 55, 67, 67, 69, 70, 75, 77
Which statement about the mean ages of the employees at the companies is true?
The difference between the mean ages of the employees of Company A and Company B is 55 years.
The difference between the mean ages of the employees of Company A and Company B is 28 years.
The difference between the mean ages of the employees of Company A and Company B is 25 years.
The difference between the mean ages of the employees of Company A and Company B is 31 years.
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Ответ:
The difference between the mean ages of the employees of Company A and Company B is 28 years.
Ответ:
(y + 3)2 – 15 = –12x + 9
(y + 3)2 = –12x + 9 + 15 = –12x + 24
(y + 3)2 = –12(x – 2)
(y – (–3))2 = 4(–3)(x – 2)Then the vertex is at (h, k) = (2, –3) and the value of p is –3. Since y is squared and p is negative, then this is a sideways parabola that opens to the left. This puts the focus 3 units to the left of the vertex.vertex: (2, –3); focus: (–1, –3)