9:2 is equivalent because it is dividing each side by the same amount. 18 divided by 2 is 9 and 4 divided by 2 is equal to 2, so 9:2 would be equivalent to 18:4.
This one you can do by multiplying the number by ten, getting 1.666, or 1+0.66. 0.66 is easy to put into a fraction form as 2/3. add the other 3/3 from the whole 1 to get 5/3. From here you either divide by 10 or multiply by 1/10, as KCF will do that anyways if you divide to get 5/30, or 1/6.
Answer:
Carlos has practiced piano for
hours.
Carlos needs to practice
hours.
Step-by-step explanation:
We have been given that Carlos wants to practice piano 2 hours each day. He practices piano for 3/4 hour before school and 7/10 hour when he gets home.
First of all, we will find piano practiced before school and after school by adding both amounts as:

Make a common denominator:


Add numerators:

Therefore, Carlos has practiced piano for
hours.
Now, we will subtract
from 2 find number of hours Carlos needs to practice to reach his goal.





Therefore, Carlos needs to practice
hours before going to bed in order to meet his goal.
13x[4+(9+2)]
13x[4+11]
13x[15]
195