Answer:
x=12
Step-by-step explanation:
1+3x=37
First minus 1 on the left and right hand side.
1-1+3x=37-1
Whenever you move a number to the other side , the sign changes. For example, you need to move 8 to the right side. Then the sign changes from positive to negative -8.
3x=36
Divide by 3 for both sides.
x=12
Check the answer:
1+3(12)=37
37=37
step 1. if the probability of choosing a red marble is 7/8 then 56(7/8) is red
step 2. 56 (7/8) = 49.
step 3. red = 49, blue = 7.