Plzz hurry :< Find the sales tax or discount to the nearest cent.
$48 jacket, 5%tax
$70 speakers at 18% off
Find the total cost or sale price.
$12 scarf, 15% off
$6.79 CD at 8.25% tax

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.

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2