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satela [25.4K]
3 years ago
9

Find the length of the unknown side. Round your answer to the nearest tenth.

Mathematics
1 answer:
dolphi86 [110]3 years ago
3 0
17.5

Explanation:

So if we use the formula a^2+b^2=c^2

We would fill it in as 4^2+b^2=18^2
Then solve

16+b^2= 324

Then subtract 16 from both sides

B^2 = 308

Then you find the square root of 308

17.5
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A chemistry teacher needs to mix a 20% salt solution with an 80% salt solution to make 20 qt of a 40% salt solution. How many qu
Svetlanka [38]

Answer:

  • 6 2/3 qt 80%
  • 13 1/3 qt 20%

Step-by-step explanation:

It is often convenient to solve a mixture problem by letting a variable represent the quantity of the higher-concentration contributor to the mix.

__

We can let x represent the number of quarts of 80% solution needed. Then (20-x) is the number of quarts of 20% solution needed. The amount of salt in the final mix is ...

  0.80x +0.20(20-x) = 0.40(20)

  0.60x = 0.20(20) . . . . . . . . subtract 0.20(20) and simplify

  x = 20/3 = 6 2/3 . . . . . . . . . divide by 0.60; quarts of 80% solution

  (20 -x) = 13 1/3 . . . . . . . . . . amount of 20% solution needed

The teacher should mix 6 2/3 quarts of 80% solution with 13 1/3 quarts of 20% solution.

3 0
2 years ago
Martina is currently 10 years older than her cousin Joey. In 3 years she will be 3 times as old as Joey. Use this information to
chubhunter [2.5K]

Answer:

m = j + 10

m + 3 = 3x

Step-by-step explanation:


8 0
3 years ago
(b) Write the ratio 12:30 in the form 1:n
kari74 [83]

answer:

1 : 2.5

explanation:

given ratio: 12 : 30

divide by 12:

  • \frac{12}{12} : \frac{30}{12}
  • 1 : 2.5

n = 2.5

4 0
2 years ago
Read 2 more answers
Help please thank you guys! Really appreciate it
dalvyx [7]

Answer:

1

Explanation:

Radius = C/2π

C is 6.28 and 2*pi is also 6.28

So 6.28/6.28 = 1.

6 0
3 years ago
Read 2 more answers
PLEASE HELP ASAP will give brainliest
sineoko [7]

Step-by-step explanation:

3n-5=(-8*6)+(-8*5n) distributive property

3n-5=-48-40n

3n+40n=-48+5 add property

43n=-43 add property

43n/43=-43/43 division property

n=-1

8 0
3 years ago
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