Dan and Bala each wanted to buy a file but found out that they did not have enough money. Dan needed $2.20 more while Bala needed $1.70 more. If they put their money together to buy only 1 file, they would still be short of $0.90. How much did the file cost?​

Me. i can't figure out this question. give an explanation too. .

Question 9 of 10 2 points suppose your sat score is 1770. you look up the average sat scores for students admitted to your preferred colleges and find the list of scores below. based on your sat score of 1770, which average score below represents the college that would be your best option? o a. 1790 o b. 2130 o c. 2210 od. 1350

What type of symmetry does a rhombus have?