868 is about 870, and 28 is about 30, so your expression would be 870 divided by 30 which would be 29 and the actual answer is 31, so your estimate would be close to your actual answer.
Answer:
7/3
Step-by-step explanation
4y+8=29-5y
First you are going to subtract 8 from both sides of the equation.
4y=21-5y
Next you are going to add 5y to each side of the equation.
9y=21
Now write it as a fraction,
9/21
Last but not least simplify.
3/7
Green, because there are more green marbles in the bag.
Just switch the negative sign over to the answer. so if you had -x = 6, then just switch the sign over to the 6. You would have the answer of x=-6, which is the same thing as -x=6
