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Wewaii [24]
3 years ago
11

1.(5x + 7) - (x + 2)

Mathematics
1 answer:
iris [78.8K]3 years ago
8 0

Answer:

4x + 5

If you need the explanation I will type it

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A and B working together can do a work in 6 days. If A takes 5 days less than B to finish the work, in how many days B alone can
svetlana [45]

Answer:

15 days

Step-by-step explanation:

Let x be the number of days needed for B to complete the job. Then x-5 is the number of days needed for A to complete the job.

In 1 day,

  • A completes \dfrac{1}{x-5} of all work;
  • B completes \dfrac{1}{x} of all work.

Hence, in 1 day both A and B complete \dfrac{1}{x-5}+\dfrac{1}{x} of all work. A and B working together can do a work in 6 days. Then

6\cdot \left(\dfrac{1}{x-5}+\dfrac{1}{x}\right)=1.

Solve this equation:

\dfrac{6x+6x-30}{x(x-5)}=1,\\ \\12x-30=x^2-5x,\\ \\x^2-17x+30=0,\\ \\D=(-17)^2-4\cdot 30=289-120=169=13^2,\\ \\x_{1,2}=\dfrac{17\pm 13}{2}=2,\ 15.

If x=2, then x-5=-3 that is impossible. So, B needs 15 days to complete the work alone.

6 0
3 years ago
What is the distance between -6 and -3 on a number line.
Brrunno [24]
The distance between -6 and -3 on a number line is 3.
3 0
4 years ago
Read 2 more answers
What is 10,000 x 10,000<br><br> not important lol I just wanna know
julsineya [31]

Answer:

100000000

Step-by-step explanation:

Basic way to do this when using 10's 100's 1000's and up, count the number of zeros on the end and multiple the first regular number then add the zeros back :D

5 0
3 years ago
Read 2 more answers
1. Find the distance from A to B. Explain how you found this distance.
DiKsa [7]

Answer:

i booper you fat you hahahhaha class of living noob this?

Step-by-step explanation:

8 0
3 years ago
phil's age is 7 years more than 1/5 times peter's age.also,4 times phil's age is 2 years less than twice peter's age .if x is pe
bearhunter [10]
Let Peters age be x
Phil's age is 1/5x+7---------------------------(i)
Phil's age can also be calculated as 
4(1/5x+7)=2x-2--------------------------------(ii)
So,
4/5x+28=2x-2
28+2=2x-4/5x
30=10/5x-4/5x
30=6/5x
x=30*\frac{5}{6}
x=25
5 0
3 years ago
Read 2 more answers
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