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2 years ago

I just need this one box.

Mathematics

2 answers:

Gelneren [198K]2 years ago

5 0

Answer: glad you got

Step-by-step explanation: guess what its...... my B-DAY

Darya [45]2 years ago

3 0

Answer:

i would help if i no it

Step-by-step explanation:

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Choose an appropriate metric unit for the mass of concrete in a section of sidewalk

ratelena [41]

Answer:

It should be a kilogram.

Gram = too small

milligram = too small

meter = distance

5 0

1 year ago

Find the common difference of the arithmetic sequence. 4, 10, 16, 22, . . .

Tpy6a [65]

Answer:

Step-by-step explanation:

10 - 4 = 6

16 - 10 = 6

22 - 16 = 6

4 0

2 years ago

Read 2 more answers

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

2 years ago

Cesium chloride is a radioactive substance that is sometimes used in cancer treatments. Cesium chloride has a biological half-li

Natalka [10]

Step-by-step explanation:

my workings and answers is in the image above

5 0

2 years ago

Read 2 more answers

Please help !!!!!!!!!

Serggg [28]

Answer:

This is some ton of work LOL

Step-by-step explanation:

A. 4/7×5/5=20/35 We multiply by 5 for A because 35÷5=7 and you need to multiply top and bottom. You can NOT forget that. We do not need to simplify something this time? 3/5X7/7=21/35. Why are we muliplying something new? figure out. no need to simplify. oBVIOUSLY 3/5 IF BIGGER

B. As usual etc...

8 0

3 years ago