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
Andrei [34K]
3 years ago
10

3r/4= 1/8 what's the value of r

Mathematics
2 answers:
olya-2409 [2.1K]3 years ago
8 0
\frac{3r}{4} =\frac{1}{8}

Cross multiply.
Note: \sf\frac{a}{b} = \frac{c}{d} \to ad=bc

Cross multiplying we get:

3r(8) = 4(1) \\ 24r = 4\\r = \frac{4}{24} \\\\r=\frac{1}{6}

I hope that helps :)
tino4ka555 [31]3 years ago
5 0
Multiplying both sides by 8, we see that 6r=1.  Dividing by 6, r=1/6.
You might be interested in
Suppose a family drives at an average rate of 60 mi/h on their way to visit relatives and then an average rate of 40 mi/h on the
hammer [34]

Answer:

Part A) 2 hours

Part B) d/60 hours

Part C) 48 miles/hour

Step-by-step explanation:

Part A) Let "d" be the distance in miles the family traveled to visit their relatives. How many hours did it take to drive there?

we know that

Let

x ----> the time it take on their way to visit relatives in hours

y ---> the time it take on the way back in hours

we know that

The distance of the way to visit is equal to the distance of the way back

The speed multiplied by the time is equal to the distance

so

60x=40y -----> equation A

y=x+1 -----> equation B

substitute equation B in equation A and solve for x

60x=40(x+1)

60x=40x+40

20x=40

x=2 hours

Find the value of y

y=2+1=3 hours

d=60x

The time it take on their way to visit relatives is 2 hours

The time it take on the way back is 3 hours

Part B) In terms of "d," how many hours did it take to drive there?

we have that

The distance is equal to the speed multiplied by the time

d=60x

Solve for x

x=d/60 hours

Part C) Write and solve an equation to determine the distance the family drove to see their relatives. What was the average rate for the entire trip?

To find the average rate for the whole trip we will need the total distance and the total time

The distance of the way to visit is

d=60x

substitute the value of x

d=60(2)=120 miles

so

The total distance is

120(2)=240 miles

we know that the total time is

2 + 3 =5 hours

The average rate for the complete trip is

240/5=48 miles/hour

5 0
3 years ago
Read 2 more answers
-) Simplify: V625<br> 15<br> 20<br> 23<br> 25
tresset_1 [31]
The answer 25 hope it helps
8 0
3 years ago
WHICH LINE HAS A SLOPE OF 0 AND GOES THROUGH (5, -8)
arlik [135]
The slope<span> of a horizontal </span>line<span>. A horizontal </span><span>line has slope 0

</span>
3 0
3 years ago
Which new angle is created by extending one side of a triangle?
Andrej [43]
Choice c. exterior sngle
4 0
3 years ago
Read 2 more answers
40% of N is 80. Find N
Aliun [14]

Answer:

i think N=32

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • Help me on Algebra it may look easy but to me it is hard
    13·1 answer
  • Each week you drive 150 miles. Your car gets 25 miles to the gallon and gas prices are $3 per gallon. How much gas money will yo
    6·1 answer
  • Complete the pattern 274÷1=
    7·1 answer
  • tres hermanos danvueltas circuito en bicicleta. el mayor tarda 18 en dar Una vuelta el del medio 24 minutos yel menos 36 minutos
    14·1 answer
  • Given the system of equations 4x - 5y=-11 and 2x + y = 5, which equation and which variable would you solve for and why?
    10·1 answer
  • Jenny has bought 24 pounds of dog food. She feeds her dog 3/8 pounds for each meal. For how many meals will the food last?
    13·1 answer
  • Simplify the ratio 48:30.Please help me
    13·2 answers
  • Express each ratio as a unit rate. Round to the nearest tenth, if necessary.
    8·2 answers
  • Helpppppppppppppppppppppppppppppppppppppppppppp
    13·1 answer
  • What is the slope of the line through (6,9)(6,9)left parenthesis, 6, comma, 9, right parenthesis and (7,1)(7,1)
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!