The height of the triangle is measured 4mm and the base is 12 mm what is the area of this triangle awnsers: 24 sq mm, 48 sq mm, 36 sq mm, and 51 sq mm

Anyone know? will mark brainliest if you're correct!

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

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