Andrew has 18 invitations to write. if he writes 3 invitations a day , how many days will it take him to finish? what type of problem is this array division, equal division with unknown group size, equal division with unknown multiplier

The measure of an angle is 117°. what is the measure of a supplementary angle?

Evaluate 5 + 6 · 2 – 8 ÷ 4 + 7 using the correct order of operations. a. 22 b. 11 c. 27 d. 5

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.