1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
shtirl [24]
2 years ago
11

Can you help me, please

Mathematics
2 answers:
harkovskaia [24]2 years ago
5 0

Answer:

x=30

Step-by-step explanation:

Mashutka [201]2 years ago
5 0

Answer:

hi there, the answer for number 12 would be x = 10. And for 13 would be x = 4/7

Step-by-step explanation:

sorry if I am wrong on either of them. But I do believe they are the right answer.

You might be interested in
How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?
kolbaska11 [484]

Answer:

120 liters of 60% alcohol solution is needed

Step-by-step explanation:

Let's assume

x liters of 60% alcohol solution  is added

so, we  get solution as

=\frac{60}{100}\times x

=0.6x

we are given

40 liters of a 20% alcohol solution is

=40\times\frac{20}{100}

=40\times\frac{20}{100}

=8

so, total alcohol solution is

=8+0.6x

now, we can find total solutions

total solutions is

=x+40

now, it is making 50% solution

so, we get

\frac{8+0.6x}{x+40} =\frac{50}{100}

now, we can solve for x

\left(8+0.6x\right)\cdot \:100=\left(x+40\right)\cdot \:50

800+60x=50x+2000

10x=1200

x=120

So,

120 liters of 60% alcohol solution is needed

4 0
3 years ago
PLEASE help a girl out! :)What is the actual area of the room?
andrey2020 [161]

Answer:

=75ft^{2}

Step-by-step explanation:

Area is found by mulitplying width and height.

A=7.5(5)\\

A=37.5\\in

The ratio is 0.5in : 1ft, so if you multiply that ratio to the answer, you should get the answer in feet.

37.5in x \frac{1ft}{0.5in} =75ft^{2}

7 0
3 years ago
Which matrix represents the system of equation below? { 8x-9y+13z=11 -8x-5y+5z=15 3x+4y-8z=-10
neonofarm [45]
Did you find the answer?
3 0
3 years ago
Read 2 more answers
Please help me I dont get this question
alisha [4.7K]

Answer:

I would have helped you but I just started learning about this

6 0
3 years ago
Read 2 more answers
The scores of individual students on the American College Testing (ACT) Program composite college entrance examination have a No
jeyben [28]

Answer:

The sample size must be atleast 3600

Step-by-step explanation:

We are given the following in the question:

The scores of individual students on the American College Testing (ACT) Program is a bell shaped distribution that is a normal distribution.

Population standard deviation = 6.0

We want that the sample standard deviation should not be more than 0.1.

Thus, the standard error should not be more than 0.1.

Standard error =

=\dfrac{\sigma}{\sqrt{n}}

Putting values, we get,

\dfrac{\sigma}{\sqrt{n}}\leq 0.1\\\\ \dfrac{6}{\sqrt{n}} \leq 0.1\\\\ \sqrt{n}\geq 60\\n\geq 3600

Thus, the sample size must be atleast 3600

3 0
3 years ago
Other questions:
  • A couple that already has two daughters wants to have another child. the couple is hoping for a son. what is the probability tha
    5·1 answer
  • What is the value of the expression? 9^2÷(-3)^0
    11·1 answer
  • Write the slope intercept form of the equation of each line through the given points
    7·1 answer
  • One hundred clothing stores go out of business. This will
    11·2 answers
  • Choose the appropriate plan letter for each question
    14·1 answer
  • The ratio of boys to girls in the gym class at a local middle school is 3:2. what percent of the gym class is girls
    9·1 answer
  • Find the 104 term of the sequence -2,1,4,7,...
    15·1 answer
  • 488, 460, 520, 544, 535<br> What is the range of the data?
    7·1 answer
  • Simplify 24÷⌈32÷(8−5)⌉−(−6)
    13·1 answer
  • _ x 2 + 1 = 25<br><br> Pls help I need the answer
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!