Answer:
Step-by-step explanation:
![\dfrac{a^{m}}{a^{n}}=a^{m-n}\\\\\dfrac{-8y^{10}}{2y^{5}}=\dfrac{-4y^{10}}{y^{5}}=-4*y^{10-5}= -4y^{5}](https://tex.z-dn.net/?f=%5Cdfrac%7Ba%5E%7Bm%7D%7D%7Ba%5E%7Bn%7D%7D%3Da%5E%7Bm-n%7D%5C%5C%5C%5C%5Cdfrac%7B-8y%5E%7B10%7D%7D%7B2y%5E%7B5%7D%7D%3D%5Cdfrac%7B-4y%5E%7B10%7D%7D%7By%5E%7B5%7D%7D%3D-4%2Ay%5E%7B10-5%7D%3D%20-4y%5E%7B5%7D)
5. 400 6. 33,000 7. 132 8. 196 9. 561 10. 4,387 11. 81 12. 588 13. 864 14.5,356 this is for all numbers
Answer
the answer is b. im not sure though
Step-by-step explanation:
Answer:
4 liters of 5% and 16 liters of 17.5%
Step-by-step explanation:
Let quantity of 5% be x liters and of 17.5% be y liters
x+y=20 hence y=20-x
Introducing percentages
0.05x+0.175(20-x)=0.15*20
0.05x+3.5-0.175x=3
-0.125x=-0.5
![x=\frac {-0.5}{-0.125}=4](https://tex.z-dn.net/?f=x%3D%5Cfrac%20%7B-0.5%7D%7B-0.125%7D%3D4)
Therefore, y=20-x=20-4=16
You need 4 liters of 5% and 16 liters of 17.5% to achieve 20 liters of 15% acid solution