What is the percent by mass of 150g of KNO3 dissolved in 400g of solution?

Which of the following is correct interpretation of the expression -4+13

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

2. there are 250 students in a school auditorium. use numbers from the box to complete the table. 16, 38, 18, 45, 25, 50, 32, 60 grade number percent of all students of students fifth 24 sixth 95 seventh 20 eight 45