Haro has 17 model cars, 31 model trucks, and 9 model airplanes on the shelf in his room. his sister thought it would be funny to hide all the red models. now haro only has 39 models on his shelf. which number sentence could be used to find how many red models his sister hid?
a. (17 + 31 + 9) – r = 39
b. 17 + 31 + 9 + r = 39
c. (17 + 31 + 9) + r = 39
d. 39 + 17 + 31 + 9 = r

where are the choices?

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see attached graph

my answer got deleted but it's a

step-by-step explanation:

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.