Find the perimeter of the following shape, rounded to the nearest tenth:

shape abcd is shown. point a is at 5, 5. point b is at 7, 3. point c is at 3, 0. point d is at 1, 2.

12.5
15.7
16
16.5

Landon wrote that 3−2.6=4. which statement about his answer is true?

The ratios of boys to girls on a soccer league is 2: 5. if there are 28 boys, how many girls are playing soccer? extra points! will mark as brainiest asap

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.