Answer:

Step-by-step explanation:
Given,
Red marbles = 3,
Green marbles = 10,
So, the total marbles = 3 + 10 = 13,

Since, here replacement is not allowed,
Thus, the probability of getting a green marble and a red marble
= first red and second green + first green second red




Note : The probability of getting a green marble first and a red marble second
= 


Answer:
cups of butter should be use to keep the same ratio.
Step-by-step explanation:
Given:
A recipe for pie dough calls for a ratio of butter to flour of 1/4 :5/6.
If you plan to use 5 cups of flour.
Now, to find the butter should be used to keep the same ratio.
So, to get the quantity of butter by using unitary method:
If,
cup of flour use then butter should be =
.
So, 1 cup of flour use then butter should be =
=
.
Thus, for 5 cups of flour butter should be =
=
.
Therefore,
cups of butter should be use to keep the same ratio.
6. x = 16; it's a scalene triangle
7. x = 45; it's a right triangle.