The equation−3(2x −5)=−12x +15 −18x is solved by four students. They each show the first step of their work. Which student has an invalid first step?

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)?

(10. in the figure, a aabc is drawn tocircumscribe a circle of radius 3 cm ,such thatthe segments bd and dc are respectively oflength 6 cm and 9 cm. find the length ofsides ab and ac.

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?