Asap- i would give 40 points just for these 3 answers i really need with 5, 6, and ! it’s due tomorrow and i have no clue what to do

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

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.

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?