Which of the following statements are true? (matrices and determenents)

1. If any row of a square matrix is zero, its determinant is zero.

2. If all numbers in a matrix are equal, its determinant is zero.

3. The determinant of any identity matrix is zero.

4. The determinant of a matrix with all positive numbers is always positive.

5. The determinant of any zero matrix is zero.

(multiple choice)

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.

The dance committee of pine bluff middle school earns $72 from a bake sale and will earn $4 for each ticket they sell to the spring fling dance. the dance will cost $400 write an inequality to determine the number, t of tickets the committee could sell to have money left over after they pay for this year's dance. what is the solution set of the inequality?