A boat traveled on a river 10 km upstream and then comes back to its starting point. Given that the trip takes 2 hours and the river has a current of 4 km an hour, write a quadratic equation that gives the boat's speed for the trip.
Responses
A 2x2 − 20x − 32 =0
B 2x2 − 8x − 32 =0
C 2x2 − 8x − 16 =0
D 2x2 − 16x − 32 =0

Answers

Answer 1

Answer:

2x² - 20x - 32 = 0

Step-by-step explanation:

Trip upstream:

distance = 10 km

time = t

current = 4 km/h

speed of boat in still water = x

speed upstream: x - 4

speed = distance/time

distance = speed × time

10 = (x - 4) × t

10 = tx - 4t

t(x - 4) = 10

t = 10/(x - 4)

Trip downstream:

Distance = 10 km

time = 2 - t

current = 4 km/h

speed downstream = x + 4

speed = distance/time

distance = speed × time

10 = (x + 4) × (2 - t)

10 = 2x - tx + 8 - 4t

10 = 2x - 10x/(x - 4) + 8 - 40/(x - 4)

10(x - 4) = 2x(x - 4) - 10x + 8(x - 4) - 40

10x - 40 = 2x² - 8x - 10x + 8x - 32 - 40

2x² - 20x - 32 = 0


Related Questions

What sides are the triangles?

Answers

Answer:

Step-by-step explanation:

From the picture attached,

In ΔABC and ΔGFE,

AC ≅ EG  [Given]

BC ≅ EF [Given]

AB ≅ FG [Given]

By the SSS property of congruence, ΔABC ≅ ΔGFE

The two triangles are related by SSS property of congruence, so the triangles are congruent.

Please Helppp pleaseeeeeeee pleaseeee

Answers

Answer:

Step-by-step explanation:

I can't see the screenshot

so like yeah

Round to the nearest tenth for the right triangle, wouldn't it be 20 or am I wrong?

Can someone help me with this please!!!

Answers

Answer:

It's B

Step-by-step explanation:

The height of a cylinder is 5 centimeters. The circumference of the base of the cylinder is 167 centimeters. Which measurement is closest to the volume of the cylinder in cubic centimeters? F 251.3 cm3 G 4,021.2 cm3 H 1,005.3 cm 628.3 cm3​

Answers

Answer:H

Step-by-step explanation:

Answer:

The answer is 1,005.3

Step-by-step explanation:

;]

A woodworker wants to cut a board that is 10.016 feet long into 4 equal-length pieces. How long will each of the cut boards be?

Answers

Answer:

2.504 feet

Step-by-step explanation:

Find the length by dividing 10.016 by 4

10.016/4

= 2.504

So, each cut board will be 2.504 feet

Solution :-

We have

[tex] \begin{cases} \sf No. \: of \: pieces = \frak{4} \\ \sf Total \: Length = \frak{10.016 \: ft} \end{cases} [/tex]

So,

Length of 1 board = 10.016/4

Length of 1 board = 2.504 ft

So,

The length of 1 board is 2.504 ft.

(5x-14)=51 how do I find x

Answers

Answer:

simply add

Step-by-step explanation:

Answer:

Step-by-step explanation:

(5x - 14) = 51

expand

5x - 14 = 51

group liked terms

5x = 51 +14

5x = 65

divide through by 5

5x÷5 = 65÷5

x= 13

Use the image to solve

Answers

The answer is

140 degree

A ringtoss toy is composed of a rectangular prism on top of a cylinder. The rectangular prism is completely filled with water. The dimensions of the rectangular prism are shown in the diagram.



What is the volume of the rectangular prism in cubic centimeters?

165 cm3

270 cm3

348 cm3

26 cm3

Answers

Answer:

270 cm3

Step-by-step explanation:

The volume of the given rectangular prism is 270 cm³.

What is Volume?

Volume is a three-dimensional quantity used to calculate a solid shape's capacity. That means that the volume of a closed form determines how much three-dimensional space it can fill.

Volume is defined as the space occupied by an object inside the confines of three-dimensional space. It is also known as the object's capacity.

We have

Length = 9 cm

Width = 2 cm

Height = 15 cm

Using the formula for volume of the rectangular prism

= length x width x height

= 9 x 2 x 15

= 270 cm³

Thus, the volume of the given rectangular prism is 270 cm³.

Learn more about Volume here:

https://brainly.com/question/15117197

#SPJ7

Find the value of x.

Answers

Answer:

16

Step-by-step explanation:

2x8

Which correlation coefficient would most likely show a weak negative association?

A: -0.07

B: -0.88

C: 0.09

D: 0.91

Answers

Answer:

Step-by-step explanation:

We can use the regression line to model the linear relationship between x and y ... x and y because the correlation coefficient is not significantly different from zero. ... If r is significant and the scatter plot shows a linear trend, the line can be used to ... If r < negative critical value or r > positive critical value, then r is significant.

please help me please will give brainliest ​

Answers

Answer:

[tex]16\sqrt{17}[/tex]

Step-by-step explanation:

The perimeter is two times width plus two times length:

[tex]2\sqrt{17} + 2\cdot 7\sqrt{17} = 2\sqrt{17} + 14\sqrt{17} = 16\sqrt{17}[/tex]

There is no way to simplify further.

X=-b +b squared -4ac
2a

Answers

Answer:

if you go to Khan Academy they put their lessons into video and thoroughly explain everything!

Step-by-step explanation:

Hope that this helps! :)

Have a great rest of your day/night!

Please thank me on my profile if this answer has helped you!

The enrollment in 1st period band class went from 20 to 26 in a month. Find the percent change.

Answers

Answer: the answer is 4/7 your welcome

You charge people $10 per hour to pick fruits and $8 per hour
to water flowers. The equations model the money you earn for
h hours by given as Picking fruits: m = 10h and Watering
flowers: m = 8h. Graph the equations, then see how much more you can earn from picking fruits than from watering flowers after 6 hours.

Answers

Fruits :
Y=10(h)

Flowers;
Y=8(h)

Given: h=6

Fruits:
10(6) = $60

Flowers:
8(6)= $48

Back to the question, how much more from picking fruits?

$60 - $48 = $12 more picking fruits.

Hope this helps!

Someone please help I’m begging you

Answers

Answer:

Graphical method

graphical method hope this helps

What is the value of y in the equation below?
8y = 96

Answers

Answer:

12

Step-by-step explanation:

just divide 96 by 8

Answer:

y=12

Step-by-step explanation:

.......ur welcome.........

96÷8=12

bcs they're 8 y we divide 96 by the no. of y to get y

ABCD is a rectangle with BC =63 and AB = 84. Find each measure.

Answers

Answer:

8. 90°

9. 18°

10. 18°

11. 105

If an official NBA basketball has a circumference of 29.5 inches, what is the approximate volume in cubic inches?

19.66


92.34

321.75

433,63

Answers

Around 433.63 would be the correct answer

1. Mr. Jackson took a cab from school to JFK Airport. The taxi fare was d dollars and he gave the
driver a 15% tip. Which of the following expressions can be used to describe the total fair? Select all
that apply.

Answers

Are there any choices?

PLSSSS HELPPP ILL GIVEE COOKIE

Answers

Answer:

Sorry. It is 4.

Step-by-step explanation:

Again, where is my cookie?

i think the answer is four

please help me if you do not know the answer dont answer it​

Answers

Factor 28r^2 + 35ry: 7r(4r+5y)
Factor -4x-5xy: -x(4r + 5y)
= 7r(4r + 5y)-x(4r + 5y)
= (4r + 5y) (7r -x)
Hope this helps, sorry if it’s confusing

Let f(x)=x^3 and g(x)= √x, and h(x)=x/3. Find each of the following: f(g(h(6)))

Answers

Answer:

go from inside out.

h(x)=x/3

[tex](\sqrt{2})^{3}[/tex]=> h(6) = 6/3 = 2

g(x) = [tex]\sqrt{x}[/tex]

=> g(h(6)) = g(2) = [tex]\sqrt{2}[/tex]

f(x) = [tex]x^{3}[/tex]

=> f(g(h(6))) = f([tex]\sqrt{2}[/tex] ) = [tex](\sqrt{2} )^{3}[/tex]

If correct I’ll give brainlist

Answers

the correct option is (1,0)

There are 28 girls and 14 boys in the school band. What is the ratio of boys to girls, in lowest terms, in the school band?

Answers

Answer:

2:1

Step-by-step explanation:

I hope it's helped.......

Answer:

Original ratio:

Boys        Girls

14:42       28:42

Lowest terms:

Boys          Girls

1:3             2:3

16x−12−24x+4


Explain your reasoning.

Answers

Answer:

-8x-8

Step-by-step explanation:

Since 16x and -24x have like variables, we can subtract to get -8x.  Then, we can add the constants to get -8.

Step-by-step explanation:

16x-12-24x+4

=16x-24x-12+4

=8x-8

thomas sold 412 boxes of cookies at a cost of 1175 what is an estimate closest to the cost of a box of cookies

Answers

Answer:

285

Step-by-step explanation:

1175 divided by 412 = 2.85194174757

that would be around 2.85

I believe it’s 2.8$ Just divide 1175 by 412 and you’ll get the answer

WILL MARK BRAINLIEST WHOEVER ANSWERS CORRECTLY

Answers

Answer:

Step-by-step explanation:

Let the relation between the total number of candies (y) and number of bags (x) is,

y = mx + b

Here, b = Extra pieces of candies sitting outside the box.

m = Candies per box

From the question,

x = 4,(Number of bags are 4)

y = 4m + 4

If total number of candies are 36,

36 = 4m + 4

4m = 32

m = 8

Each bag will contain 8 candies.

Therefore, equation representing the relation is,

y = 8x + 4

Now complete the table by substituting the values of x,

    x                 y

    1                 12                    

    2                20

    3                28

    4                36

    5                44

    6                52

    7                60

    8                68

    9                76

   10                84

Find the area of the triangle shown above

Answers

Answer:

the area is 32 square inches

Step-by-step explanation:

you multiply both sides that have 9 because they are equal and then you add the 14 on

Answer:

63 Inches

Step-by-step explanation:

The formula for finding the area of a triangle is:

(b*h)/2

First, let's plug in the values.

(14*9)/2

Simplify...

126/2

Divide the two which gives us:

63

Therefore, the answer is:

63 Inches.

Hope this helps!

What is the solution to the equation 3 + 4 sqr root 4y = 4?

Answers

Answer:

1/64

Step-by-step explanation:

Given the expression

3+4√4y = 4

4√4y = 4-3

4√4y = 1

√4y = 1/4

Square both sides

(√4y)²= (1/4)²

4y = 1/16

y = 1/16 * 1/4

y = 1/64

Hence the value of y is 1/64

HELP I AM IN A TEST AND SOMEONE DELETED MY OTHER QUESTION BEFORE! AND I STILL NEED HELP PLZ I WILL GIVE BRAINLIEST AND THANKS AND 5 STAR PLZZ!
ALSO, plz show work for number 2 and the rest. Just tryna pass └(^o^)┘

Answers

Answer:

2.

30-7x4 = 2

3.

80

Step-by-step explanation:

2.

First, do 7x4, which equals 28. Then subtract that from 30, and you get 2.

3.

Do the parentheses first, 21-6=15. Then 15 divided by 0.2 = 75. 75+5=80.

Sorry I couldn't help on any of the other ones, I don't have much time.

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