estimate a 15% on a dinner bill of $42.58 by first rounding the bill amount to the nearest ten dollars

$6

Step-by-step explanation:

Round $42.58 to the nearest ten dollars to get $40. $40 ÷ 100 = $0.4 so this is one percent. $0.4 × 15 is $6 which is an estimate of 15% of $42.58.

The answer is $6 (unless if you are meant to add this to $42.58 - then the answer would be $48.58 - but I am not sure because of the wording of the question).

answer: median

step-by-step explanation:

the median is the middle value when a data set is ordered from least to greatest

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72