Which two expressions are equivalent? A. 7(3 + x) and 7∙ 3 + 3 ∙ x
B. 7 + 3 + x and (7 + 3) + x
C. 7 ∙ x ∙ 3 and 7(x + 3)
D. 7 ÷ (3 – x) and 7 ÷ (x – 3)

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Step-by-step explanation:

b

Step-by-step explanation:

a isn't it because it multiplies 7 by 3 added with x. the second equation next to it is simply not equal to it.

b is slightly referring to a property called "the associative property of addition." the associative property of addition is simply adjusting the place of the parenthesis. per example:

(1+2)+3=1+(2+3)

either way, you still get the same answer.

c isn't it because 7*x*3 is all multiplied, as to the second equation, part of it is being added, then multiplied by 7.

d cannot be it because we do not know if x is < or > than 3.

blue marble is 15 times out of 50 = 15/50 reduces to 3/10

landing on tails is 24 out of 50 = 24/50 reduces to 12/25

to find the probability of both multiply together:

3/10 x 12/25 = 3 x 12 / 10 x 25 = 36/250

if you multiplied the numerator and denominator by 10 you get 360/2500.

the answer is 360/2500