Find the standard deviation for the following test scores. Use the chart below to record the steps.
85,100,92,96, 87, 94, 75, 56, 60

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. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Precalculus question, image attached.