Answer
Elena must have substracted 1/2x from both sides of the equation.
Lin must have multiplied both sides of the equation by 2
Explanation
The equation given is

For Elena to have arrived at

Then Elena must have substracted 1/2x from both sides of the equation.
That is;

For Lin to have arrived at

It shows Lin must have multiplied both sides of the equation by 2
That is;
I believe the sides of the suare is 9
Answer:
The given probability distribution is a discrete probability distribution.
Step-by-step explanation:
We are given the following in the question:
x: 3 4 7
P(X=x): 0.19 0.3 0.51
Property of discrete probability distribution:

If the given probability distribution satisfies this property then, it is a discrete probability distribution.

Thus, it satisfies the property for a discrete probability distribution.
Thus, the given probability distribution is a discrete probability distribution.
Answer:
10 feet
Step-by-step explanation:
18 × 2 = 36
56 - 36 = 20
20 ÷ 2 = 10
To check work, add all lengths together. 4 sides. 18 + 18 + 10 + 10 = 56
He would need 36 carmel squares to make 2 batches