Apackage delivery firm charges according to the
package's weight.

the charge is $1.10 for packages
weighing up to three ounces, inclusive.

for packages
weighing more than 3 ounces and up to ten ounces,
inclusive, the charge is $2.25.

for packages weighing
more than ten ounces and up to fifteen ounces, inclusive,
the charge is $3.35.

for packages weighing more than fifteen ounces, the company has a different price setting.

let c(x) be the cost in dollars according to the package's
weight (x). write a piecewise-defined function that
represents the situation.

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?

Sara has 2 2/3 cup taco meat. she needs 1/6 cup to make one taco. how many tacos can sara make with the taco meat she has?