Answer:
x=-1
Step-by-step explanation:
3x−12=5(x−2)
3x+−12=(5)(x)+(5)(−2)(Distribute)
3x+−12=5x+−10
3x−12=5x−10
Step 2: Subtract 5x from both sides.
3x−12−5x=5x−10−5x
−2x−12=−10
Step 3: Add 12 to both sides.
−2x−12+12=−10+12
−2x=2
Step 4: Divide both sides by -2.

x=-1
espero que esto ayude :)
Your question is quite incomplete: who's k?
Anyway, I'm assuming that this is one of those question about variation. If x and y are in proportion, we have

If x and y are in inverse proportion, we have

Answer:
75
Step-by-step explanation:
We know that 80% of Andrew's (former) baseball card collection is 60. Thus, We divide 60 by 80% (equal to 0.8) to obtain
.
so after the 10 non soloists join, there would be 60 students total and 12 of them are soloists.
12 is 20% of 60
Final Answer:
20% of the choir are soloists.
Hope this helped!
Have an awesome day :)
Answer:
36°
Step-by-step explanation:
By remote interior angle theorem:
b + 81° = 117°
b = 117° - 81°
b = 36°