Which system of equations has exactly one solution? 2x - 4y= 8
X+ y = 7

3x+y=-1
6x+2y = -2

3x+3y=3
-6x-by=3

3x-2y = 4
-3x+2y = 4

I need help please

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)

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?