The ratio of the number of marbles in the red bag to the number in the blue bag is 3 : 5 Two marbles are moved from the blue bag to the red bag, making the ratio 7 : 9.

How many marbles are there in total?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

2x minus y equals 6, x plus y equals negative 3

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.