The domestic postage rate for first-class letters weighing 3.5 oz or less is 39 cents for the first ounce (or less), plus 16 cents for each additional ounce (or part of an ounce).
express the postage p in dollars as a function of the weight x of a letter, with 0 < x ≤ 3.5, and sketch the graph of this function.
p(x) = $
if 0 < x ≤ 1 $
if 1 < x ≤ 2 $
if 2 < x ≤ 3 $
if 3 < x ≤ 3.5

40 i don’t know lololol

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west