Can someone help me understand this? Give awnsers in simplest form:

a. (1/2 - 1/3) x (1/4 + 1/5 divided by 1/6)

b. 6 squared divided by 3/2 x (1 3/4 x √4)

c. 7/8 x 1 1/4 divided by (3/16 - 1/8)

d. 9/8 x (2/5 + 3/7 x 1/3 + 3/5) x 4​

What is the equation of the graph below? y=sec(x)-4

The value √10 and √15 are plotted on the number line

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)?