B. Exactly one solution
7y +21 = 5y +8
7y +13=5y
13=-2y
-6.5=y
To find percentages, simply take the number that is not the "100%" number and divide it by the other number.
in this case,
52 / 130
complicated way of figuring it out if it makes more sense for you,
find how much is 1% of 130
130/100= 1.3
1% of 130 = 1.3
and then you just take 52 / 1.3
feel free to comment any questions on how to figure out future problems
Answer:
I can't help you too much but for the first one its never repeat your ex
