Answer:
x=-7
Step-by-step explanation:
5-x=3(x+11)
Distribute 3 to the parenthesis. (Multiply)
5-x=3x+33
Subtract 33 from both sides.
-28-x=3x
Add x to both sides,
-28=4x
Divide both sides by 4.
-7=x
Answer:
13 l of 15%, 13 l of 25%, 26 l of 70%
Step-by-step explanation:
solutions:
final solution:
This includes 0.45*52l= 23.4 l acid
Let's assume:
- amount of 15% solution= x
- amount of 25% solution= y
- amount of 70% solution= z
- and we have z=2y
so there are 2 equation:
or
- x+y+2y= 52 ⇒ x+3y= 52 ⇒ x= 52- 3y
- 0.15x+1.65y=23.4
- 0.15*(52-3y)+1.65y=23.4
- 7.8-0.45y+1.65y=23.4
- 1.2y=23.4-7.8
- 1.2y= 15.6
--------
- x= 52- 3*13= 13 l
- z= 2y= 2*13= 26 l
Answer:
6 pages a day
Step-by-step explanation:
3 + 5 + 10 = 18 pages
18 pages / 3 days = 6 pages a day
Answer:
12
Step-by-step explanation:
20² - 16² = x²
400 - 256 = x
400 - 256 = 144
√144 = 12