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IRISSAK [1]
3 years ago
8

Person 1 can do a certain job in 21 minutes, and person 2 can do the same job in 28 minuets. When completing the job together, w

hich expression would be used to represent the amount of work done by person 1. 21,1/21,x/21,21x
Mathematics
1 answer:
Hoochie [10]3 years ago
8 0

Answer:

1/21.

Step-by-step explanation:

To solve the problem 'How long would they take to do the job working together?'  you would work in fractions of the job done / minute:

1/21 + 1/28 = 1/x.

So for person 1 the expression is 1/21.

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PLEASE I NEED HELP ASAP​
Kruka [31]

Answer:

determine all the other angles amount and that will give you your answer, also find the two 180 degree angles, such as the one flat going left to right and the one at an angle going left to right

Step-by-step explanation:

5 0
3 years ago
Write an equation that is perpendicular to the line 8x-4y=12 and pass through the origin
fenix001 [56]
Answers


Explanation

So first we’re gonna change the equation to y=Mx+b by subtracting the 8x and then dividing both sides by -4. This can be show like this

8x-4y=12
-8x. -8x

-4y=-8x+12
/-4. /-4

Y=2x-3

So now that we have the equation in Y=Mx+b. The problem still isn’t done because it’s asking us to set up an equation that’s perpendicular. Which means the slope becomes the opposite

So the slope isn’t 2 anymore but instead -1/2! So now that we know that we need to make the line go through the origin which is very easy because you can just set the y intercept to 0.

So now that the perpendicular line is

Y=-1/2x or y=-1/2x +0

I hope I explain this well!

Please mark as Brainliest
7 0
2 years ago
Eric drove 248 miles in 4 hours. If he continues to travel at the speed, how far will he go in 7 hours and 30 minutes?
qaws [65]
248/4=62
62•7 1/2=465 miles

He will go 465 miles in 7 hours and 30 minutes
6 0
3 years ago
Read 2 more answers
What is the sum1,000+2,000=
Valentin [98]

Answer:

3000

Step-by-step explanation:

1000 + 2000 = 3000

4 0
3 years ago
A system of equations is shown below.
Nimfa-mama [501]
-3x + 7y = -16 . . . (1)
-9x + 5y = 16 . . . .(2)

(1) x 3 => -9x + 21y = -48 . . . (3)
(2) - (3) => -16y = 64 . . . (4)

Required equivalent system of equations is
-9x + 5y = 16
-16y = 64
5 0
3 years ago
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