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4 years ago

How you make 8 21/40

Mathematics

1 answer:

Margaret [11]4 years ago

3 0

Multiply the whole number by the denominator (8*40=320) then add it to the numerator (320+21=341).
Then you get 341/40

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Archy [21]

Answer:

I believe that the answer is B) 90 - 100 minutes.

Step-by-step explanation:

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3 years ago

The value of a collectible is changing such that dv/dt = 2t/(sqrt(t^2+1)) given in 4/year, and t is the number of years from 200

alina1380 [7]

Answer:

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3 years ago

What is w+ 1/x + 1/y + 1/z if w=20, x=23, y=19, and z=28

scoundrel [369]

If W=20 put it in for W, Same with all the other letters: so now we have: 20+1/23+1/19+1/28. Now divide: 1/23=.043, 1/19=.053, 1/28=.036... Now add: 20+.043+.053+.036=20.132. The answer is 20.132 :)

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4 years ago

a motorboat traveling with a current can go 160km in 4 hours. against the current it takes 5 hours to go the same distance. find

irakobra [83]

The speed of motorboat is 36 kmph and speed of current is 4 kmph.

Step-by-step explanation:

Distance covered in 4 hours = 160 km

Time took on return trip = 5 hours

Let,

x represent the speed of boat.

y represent the speed of current.

Combined speed of boat and current when in same direction = x+y

Speed of boat and current when travelling against = x-y

Distance = Speed * Time

Speed = $\frac{Distance}{Time}$

x+y = $\frac{160}{4}$

x+y = 40 Eqn 1

x-y = $\frac{160}{5}$

x-y = 32 Eqn 2

Adding Eqn 1 and Eqn 2

$(x+y)+(x-y)=40+32\\x+y+x-y=72\\2x=72$

Dividing both sides by 2

$\frac{2x}{2}=\frac{72}{2}\\x=36$

Putting x=36 in Eqn 1

$36+y=40\\y=40-36\\y=4$

The speed of motorboat is 36 kmph and speed of current is 4 kmph.

Keywords: linear equation, addition

Learn more about linear equations at:

#LearnwithBrainly

8 0

3 years ago

AB bisects angle LAX and angle LAB measures 32 degrees. Find the measure of angle LAX

ANEK [815]

check the picture below.

to bisect and angle, simply means to cut it into two equal halves, so if ∡LAB is 32°, then ∡LAX is 32° + 32°.

3 0

3 years ago