How many milliliters of a 46% salt solution do we need to mix with 6 milliliters of a 35% salt solution so that the resulting mixture is a 43% salt solution? PLEASE HELP THANK

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

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Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. after tax the total is 45.99. what percentage of the subtotal is the total?