Please help me with this because i don’t understand stand this
2 answers:
Answer:
52 degrees
Step-by-step explanation:
Complementary angles have a sum of 90. This means when added they will equal 90. So to solve had the 2 expressions and set them equal to 90.
This looks like, . Then, isolate the variable and solve.
- Remove the parentheses
2x +18 +6x -8 =90
- Add like terms
8x +10 =90
- Subtract 10 from both sides
8x = 80
- Divide both sides by 8
x=10
Finally, plug 10 in for x in the expression for angle b. This equals 52 degrees.
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Answer:
4 liters of 5% solution and 16 liters of 17.5% solution we need.
Step-by-step explanation:
Let us assume that x liters of 5% solution and y liters of 17.5% solution are taken.
So, x + y = 20 ........ (1)
As the final solution is of 15%, so we can write
⇒ 5x + 17.5y = 300 ......... (2)
Now, solving equations (1) and (2) we get,
17.5y - 5y = 200
⇒ 12.5y = 200
⇒ y = 16 liters
Hence, x = 20 - y = 4 liters.
Therefore, 4 liters of 5% solution and 16 liters of 17.5% solution we need. (Answer)