In a sample of 80 children, the mean age at which they first began to combine words was 16.51 months with a sample standard deviation of 9.59 months. Construct a 95% confidence interval for the mean age children begin to combine words.

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.

the anwser is d) 75°

step-by-step explanation: