In a study of 250 adults, the average heart rate was 70 beats per minute. assume the population of heart rates is known to be approximately normal, with a standard deviation of 12 beats per minute. what does a margin of error of 2 for the 98% confidence interval of the average beats per minute mean? in a study of 250 adults, the average heart rate was 70 beats per minute. assume the population of heart rates is known to be approximately normal, with a standard deviation of 12 beats per minute. what does a margin of error of 2 for the 98% confidence interval of the average beats per minute mean?

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1