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
S_A_V [24]
3 years ago
7

The speed of a stream is 4 mph. A boat travels 10 miles upstream in the same time it takes to travel 18 miles downstream. What i

s the speed of the boat in still water?
The speed is
mph.
Mathematics
1 answer:
marin [14]3 years ago
4 0

Answer:

This is an RTD question. Here is a table based on the given information:

up/down . . . .rate . . . .time . . . .distance

upstream . . . . r-4 . . . . T . . . . 7

downstream . . . . r+4 . . . . T . . . .15

Now, rate x time = distance, so

time = distance / rate.

solve each for T and we get

T = (7/(r-4))

T = (15/(r+4))

set the times equal and we get

7%2F%28r-4%29+=+15%2F%28r%2B4%29

cross multiply to get

7r+%2B+28+=+15r+-+60

subtract 7r to get

28+=+8r+-+60

add 60 to both sides to get

88+=+8r

divide by 8 to get

r+=+8tep

You might be interested in
A dime has the same value as 10 pennies. marley brought 290 pennie to the bank.How many dimes did marley get?
DanielleElmas [232]

Answer:

29

Explanation:

10 pennies= 1 dime

so you divide 290÷10

which equals 29

So Marley got 29 dimes

8 0
3 years ago
your turkey must cook for 5 & a half hours. You want to eat at 4 o'clock.It will take 15 minutes to carve the turkey. At wha
kkurt [141]
The turkey will go into the oven at about 10:15
hope ti helps
and choose brainliest answer
5 0
3 years ago
Read 2 more answers
D^2 + 2d - 8 = 0<br> explain plz
schepotkina [342]

Answer:

d^2 +2d-8=0

first pick two numbers which add up to make +2 and by multiplying those two numbers they should be able to create -8.

so for example 4 and 2

4-2=2

4 x -2= -8

so now factorise:

d^2 +2d-8=0

d^2+4d-2d -8=0

d(d+4)-2(d+4)=0

d+4=0       d-2=0

d=-4          d=2

Step-by-step explanation:

7 0
3 years ago
Write two equations. the first equation should express the area of the square (a as a function of the length (l of a side. the s
Sergeu [11.5K]

Answer:

a = l²

v = s³

Step-by-step explanation:

The area of a rectangle is the product of its length and width. When that rectangle is a square, the length and width are the same. Here, they are given as "l". Then the area of the square is ...

a = l·l = l²

__

The volume of a cuboid is the product of its height and the area of its base. A cube of edge length s has a square base of side length s and a height of s. Then its volume will be ...

v = s·(s²) = s³

The two equations you want are ...

• a = l²

• v = s³

6 0
3 years ago
What is the distance between point A and B , to the nearest tenth ?
kondaur [170]
I can’t see where they are
6 0
3 years ago
Other questions:
  • How many meters are in a yard
    5·2 answers
  • In the diagram, the vertices of the square lie at the centers of the four partial circles. What is the area of the entire shape,
    15·2 answers
  • The length of a rectangle is 3 feet more than twice the width. The perimeter is 128 feet. Find the length and width.
    8·1 answer
  • What is -14 squared + 5675843
    15·1 answer
  • A coin dealer is having paper wraps made to go around a stack of coins. The coins have a diameter of 12 mm, and the dealer state
    8·2 answers
  • Find the second, fifth and ninth of <br> A(n) =2+(n-1) (3)
    13·1 answer
  • What is the conjugate <br> √8-√9​
    9·2 answers
  • The product of x and 3 is greater than it equal to -28
    14·2 answers
  • Select the correct answer.<br> What is the value of g(-4)?
    9·1 answer
  • PLZ HELP!!! WILL GIVE BRAINLIEST
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!