An srs of 100 postal employees found that the average time these employees had worked for the postal service was = 7 years, with standard deviation s = 2 years. assume the distribution of the time the population of employees has worked for the postal service is approximately normal, with mean μ. are these data evidence that μ has changed from the value of 7.5 years of 20 years ago? to determine this, we test the hypotheses h0: μ = 7.5, ha: μ ≠ 7.5

Hurry and answer this! circle x with a radius of 6 units and circle y with a radius of 2 units are shown which steps would prove the circles similar? translate the circles so they share a common center point, and dilate circle y by a scale factor of 4. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 4. translate the circles so they share a common center point, and dilate circle y by a scale factor of 3. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 3

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?