Find 3 3/4 -1 2/3 find the difference 3 3/4 -1 2/3 equals 3 9/12- 1 8/12

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?