If a=-9 and b= -4, what is the value of a + b?
0-5
5
-13
13

Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. the mean arrival rate is 10 passengers per minutes. compute the following probabilities. p(x = 4) p(x > 11)

What is the number 321,000,000 in scientific notation? also what is the number? ?

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2