5) If he installed 20 in 2 minutes, then you divide 20 by 2 to get 10 sheets per minute
7) If the ratio is 8:7 and you know that she finished 56, then divide 56 by 8 to get 7 and then multiply 7 by 7 to find balance the ratio 56:49. 56+49=105
8) To solve this, you first need to find the prices for one of each kind of bag. You need to divide 8.73 by 3 and 6.08 by 2, which gives you $2.91 for a bag of red grapes and $3.04 for a bag of green grapes, the green grapes are more expensive.
9) I did not graph it, but I can tell you that 70 bags of cashews would be $35 dollars because it is $5 per 10 bags and 7x5 is $35
I hope this helps!