The chance that an office's sprinkler system will fail is 20%; the chance that its alarm system will fail is 10%; and the chance that both will fail is 4%. What is the chance that either the sprinkler or the alarm system will fail?
A) 26%
B) 30%
C) 34%
D) 45%

The answer is b

Step-by-step explanation:

20+10=30

triangle abc is reflected on the line x=-6.5 then reflected again on the x axis

step-by-step explanation:

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b