HELP with math homework please!!!!????

Question

My friend wasn't exactly sure when I asked her these questions...

A $98 dress is marked down to $64.68. Find the percent of change.


Suppose two number cubes are rolled. What is the probability that the sum of the numbers rolled is not 7?

Answer 1

1) discount amount = 98 - 64.68 = 33.32
discount = 33.32 / 98 = .34 or 34%

you can check this by multiplying 34% times 98 and you will get the discounted amount off leading you to the current price of 64.68

2) total number of combinations on two dice = 6*6 = 36
number of ways to get a 7 are: 1 and 6, 2 and 5, 3 and 4, 4 and 3, 5 and 2, and 6 and 1.

there are a total of 6 ways of rolling a 7.

therefore there are 30 ways of not rolling a 7 giveing a probability of 30/36 of not rolliwn g a 7. 30/36 = 5/6.

Answer 2

98-64.68=33.32 reduction. As a fraction of the original price this is 33.32/98=.34. To get as percentage multiply by 100. I.e. it is a 34% reduction.

There are 6 ways to get numbers adding to 7 ({1,6} or {2,5} or {3,4} or {4,3} or {5,2} or {6,1}). There are 36 different ways of throwing two die (6*6=36). So probability that sum IS 7 is 6/36=1/6. So to get probability that the sum IS NOT 7, we simply subtract this from 1 (since sum is EITHER 7 or not 7).
=> prob=5/6

Answer 3

64.68/98= 0.66
this means the price is 66% of the original price
so the %age change is (100-66)= a 34% reduction

Answer 4

(98 - 64.68)/98*100 = % change

6*6 = 36 possible rolls

By listing, you can find out how many ways to get 7:
1,6
2,5
3,4
4,3
5,2
6,1
Six ways.
So 36-6 = 30 ways to NOT get 7.
30/36 = 5/6 chance of not getting 7

Answer 5

The first answer is (98-64.68)/98 *100=34%;
the second answer is 31/36.

Answer 6

percent is 98 divided by 64.68

Answer 7

(final price - intial price) / intial price

(64.68 - 98) / 98 = -.34

so decreases by 34%

Answer 8

the second one is:

5/6

i dont know the first one

Answer 9

1) 34%
2) ???