Simplfy 7a - 2b - 5a + 7b

Answer is in the photo. I can only upload it to a file hosting service. link below!

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2a+5b

Step-by-step explanation:

7a-5a =2a

-2b+7b = 5b

its 8

step-by-step explanation:

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %