P = 2l + 2w; unde P = the perimeter of rug; l = the length; w = the width;
176 = 2l + 2w;
Then, l = 7w ;
_______________
176 = 2*7w + 2w;
176 = 14w + 2w;
176 = 16w;
w = 176÷16;
w = 11ft;
l = 7 * 11;
l = 77ft;
Answer:
20 blue, 10 red, 40 yellow. There are no clues to how many black.
Step-by-step explanation:
Total number of bulbs tested, N = 445
Number of bulbs that lasted more than 500 hrs, x = 316
Point estimate of bulbs that lasted more than 500 hrs = x/N = 316/445 ≈ 0.71 = 0.71*100 = 71%
me to so we don’t know how long it is for you
