Fashion designer wants to know how many new dresses women buy each year. Assume a previous study found the variance to be 4. She thinks the mean is 7 dresses mer year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.11 at the 90% level of confidence? Round your answer up to
the next integer.

Please help

Solve the formula ax+ by = c for x.

I've been working on this for a few days and i just don't understand, it's due in a few hours. you.the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α.part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part bsuppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case.part cnow try a numerical problem. what is the direction of the vector w = < -1, 6 > ?

Ineed here’s a picture of the question