What happens to energy in an open system? A. Energy can enter but not exit an open system.
B. Energy can enter or exit an open system.
C. Energy can exit but not enter an open system.
D. Energy cannot enter or exit an open system.
SUB

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

Which represents the solution set of the inequality 5x-9 < 21? a. x < 12/5 b. x > 12/5 c. x > 6 d. x < 6

3x + 4y = 5 x- 3y = -7 solve by substitution