Suppose that scores on the mathematics part of the national assessment of educational progress (naep) test for eighth-grade students follow a normal distribution with standard deviation =110. you want to estimate the mean score within ±10 with 90% confidence. how large an srs of scores must you choose? give your answer as a whole number.

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7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]