Question

please help

b/b-1=9/7

Answer 1

Cross multiply first .......

Answer 2

from there you get
9b-9=7b. get it because your multiplying the diagonals.

Answer 3

the earth has a diameter of about 1.27 times 10^4 kilometers. the dwarf planet plutos diameter is estimated to be about 2.3 times 10^3 kilometers about how many times larger is the diameter of earth compared to pluto?
a. 1/2
b. 2
c. 5
d. 10

Answer 4

the rest is easy algebra!

Answer 5

yes you are right collect similar terms ......