Answer:
since the unknown amount can buy 100 pencils
he bought 70 pencils
therefore $4.50 can buy 30 pencils
so 1 pencils cost $4.50 /30=0.15
Your question is:
![\frac{8u}{u^2-18u+81} -\frac{72}{u^2-18u+81}](https://tex.z-dn.net/?f=%5Cfrac%7B8u%7D%7Bu%5E2-18u%2B81%7D%20-%5Cfrac%7B72%7D%7Bu%5E2-18u%2B81%7D)
Then, the above formula equate:
![\frac{8u-72}{u^2-18u+81}](https://tex.z-dn.net/?f=%5Cfrac%7B8u-72%7D%7Bu%5E2-18u%2B81%7D)
Factor out 8 from the numerator we get:
![\frac{u-9}{u^2-18u+81}](https://tex.z-dn.net/?f=%5Cfrac%7Bu-9%7D%7Bu%5E2-18u%2B81%7D)
Factorization of the denominator:
![\frac{u-9}{(u-9)^2}](https://tex.z-dn.net/?f=%5Cfrac%7Bu-9%7D%7B%28u-9%29%5E2%7D)
Simplifying the numerator and the denominator by (u-9) we get:
Answer:
unlikely
Step-by-step explanation:
5/31 = 0.1613 : 16.13% < 50% unlikely