Susie is participating in a bake sale for a fundraiser. she baked 8 pies to sell. two pies weigh 105 g each, one pie weighs 106 g, two pies weigh 108 g each and the last three pies weigh 103.5 g, 102 g and 104.5 g. what is the average weight of the pies rounded to two decimal places?

the first week at javier's new job he spent $12.48, $9.50, $10.25, $4.99, and $8.59 on lunch.
in the second week, he spent $3 more in total for the 5 lunches than the first week.
what is the increase in the mean for the second week compared to the first?
round the answer to the nearest penny.

For the first question, you need to find the mean (average) of the set of numbers. To do this add them all up. 105+105+106+108+108+103.5+102+104.5=842. Next, you need to divide the sum by the amount of numbers in the set. So. 842 divided by 8 (since theres 8 numbers) is 105.25. 
The answer is 105.25 grams.

For the second question, do the exact same thing for the two sets of numbers and compare the answers. Next, subtract the second weeks amount by the first week, which is 9.762-9.162. You will get 0.6.
The answer is 0.6 cents

2x+18+5x-9

2x+5x18-9

7x+9

7. 7

x= 1.4

hope it helps