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
Naya [18.7K]
3 years ago
10

Please? I need help here

Mathematics
1 answer:
Yuki888 [10]3 years ago
3 0

Answer:

<h2>D</h2>

Step-by-step explanation:

If pair of ratios does form a true proportion then:

a:b=c:d\to\dfrac{a}{b}=\dfrac{c}{d}\to ad=bc

A)\\\\8:14=20:35\to\dfrac{8}{14}=\dfrac{20}{35}\\\\(8)(35)=(14)(25)\\\\280=280\qquad\bold{TRUE}\\\\b)\\\\\dfrac{6}{10}=\dfrac{15}{25}\\\\(6)(25)=(10)(15)\\\\150=150\qquad\bold{TRUE}

c)\\\\\dfrac{9}{5}=\dfrac{27}{15}\\\\(9)(15)=(5)(27)\\\\135=135\qquad\bold{TRUE}\\\\d)\\\\12:15=30:50\to\dfrac{12}{15}=\dfrac{30}{50}\\\\(12)(50)=(15)(30)\\\\600=450\qquad\bold{FALSE}

You might be interested in
Two buses leave towns 304 miles apart at the same time and travel toward each other. One bus travels 14 mih slower than the othe
8090 [49]

Answer:

The faster bus moves at 83mi/h and the slower one moves at 69mi/h.

Step-by-step explanation:

Let's define:

R₁ = rate of bus 1, this is the faster one.

R₂ = rate of bus 2, this is the slower one.

We know that one bus travels 14mi/h slower, then:

R₂ = R₁ - 14mi/h.

Now we know that:

Distance = Speed*Time.

If we add the distances that both busses travel in 2 hours, it should be equal to the initial distance between the buses, then:

R₁*2h + R₂*2h = 304 mi

Then we have the two equations:

R₂ = R₁ - 14mi/h

R₁*2h + R₂*2h = 304 mi

The first step is to replace the first equation in the second one, to get:

R₁*2h + (R₁ - 14mi/h)*2h = 304 mi

And now we can solve this for R₁.

R₁*2h + R₁*2h - 14mi/h*2h = 304 mi

R₁*4h - 28mi = 304mi

R₁*4h = 304mi + 28mi = 332mi

R₁ = 332mi/4h = 83mi/h

The faster bus moves at 83mi/h

And we know that the slower one moves at 14mi/h slower than this, then:

R₂ = R₁ - 14mi/h = 83mi/h - 14mi/h = 69 mi/h

7 0
2 years ago
Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains
fenix001 [56]
So 5 liters of natural for every 7 synthetic, so 5 / 12 liters are natural oil.

so; 684 × (5/12) = 285 liters of natural oil

Hope this helps!
7 0
3 years ago
Please help me with this
matrenka [14]

Answer:

44

Step-by-step explanation:

A=a+b

2h=6+5

2·8=44

8 0
3 years ago
Why is volume not a dose?
Ket [755]

Answer:

concentration

Step-by-step explanation:

Because concentration is a factor to how much of a volume to give

4 0
2 years ago
What is the length of arc S shown below? Enter an exact expression. The angle in the figure is a central angle in radians.
Makovka662 [10]

Answer:

h

Step-by-step explanation:

n

4 0
3 years ago
Other questions:
  • What is the value of x in the solution to the system of linear equations?
    15·2 answers
  • Which fraction has the same value as 2 3<br> 8
    5·1 answer
  • Figure 1 is dilated to get figure 2. What is the scale factor?
    15·1 answer
  • Maureen budgets $1420 each month for fixed expenses. what percent of her net monthly income is that if she nets $2200 semimonthl
    11·1 answer
  • A company invests $10,000 in a mutual fund account that earns a fixed
    5·1 answer
  • Algebra 1
    10·1 answer
  • (5^-4/4^-6) multiplied by 5^3
    13·2 answers
  • A projectile travels 1,440 feet per second. How fast is the projectile in miles per hour?
    12·2 answers
  • What is:<br> k–66≤ – 84<br> in one-step inequalities?
    6·1 answer
  • A boy spent 3/8 of his money and had 15.00 left. How much did he spend?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!