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MaRussiya [10]
3 years ago
12

What is the estimated mean​28-day strength of this concrete if the​ 7-day strength is 3000​psi?

Mathematics
1 answer:
LUCKY_DIMON [66]3 years ago
6 0

Answer:

12,000psi

Step-by-step explanation:

Given the 7 days strength of a concrete to be 3000psi, to calculate the estimated mean​28-day strength of this concrete the following equality equation is applied

7 days strength = 3000psi

28days strength = y

To get y, we will Cross multiply

7 × y = 28×3000

7y = 28×3000

7y = 84000

Divide both sides by 7

7y/7 = 84000/7

y = 12000

hence the estimated mean 28-day strength of this concrete is 12,000psi

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Tom has 5 comic books in his collections and receives 5 new comic books each month. Joe has 145 comic books, but sends 5 to each
Sindrei [870]

Answer:

In 7 Months both will have same number of comic books.

The both will have 40 comic books in 7 months.

Step-by-step explanation:

Let Number of months be x.

Given:

Tom Has number comic books = 5

Each month he receives number of books = 5

Total Number of books he has after x month can be calculated by sum of number of comic books he has + number of comic books he receives multiplied by number of months

Hence Total Number of books he has after x month = 5+5x

Also Given:

Joe Has number comic books = 145

Each month he send number of books to 1 friend = 5

Number of friends = 3

Hence books send to friend each month = 5\times3 =15

Total Number of books he has after x month can be calculated by Difference of number of comic books he has and number of comic books he send to friends multiplied by number of months

Hence Total Number of books he has after x month = 145-15x

We need to find the number of months in which both will have same number of of comic book.

Hence we can find by making both equation equal we get;

5+5x=145-15x

Combining same terms we get;

5x+15x=145-5\\20x =140\\x=\frac{140}{20}=7 \ months

Hence the will have same number of comic books after 7 months.

Now we need to find the number of books the both had after 7 months:

Tom has = 5+5x=5+5\times7= 5+35=40\ books

Joe has = 145 - 15x = 145 - 15\times7 = 145-105 = 40 \ books

Hence they both will have 40 comic books after 7 months.

4 0
3 years ago
If two marbles are randomly selected from the bag without replacement, what is the probability that the first marble is blue?
joja [24]

Answer:1,0.5, or 0 it depends

Explanation:

The probability that one event occurred depends on the total of random event, being 1 the most of the probabilities

If the two marbles are blue the probability to select a marble blue is 1

If one of the marbles is blue and the other marble is of any color the probability to select the blue marbles is:

P=1 - 1/2=1/2

Being 1/2 or 0.5 the answer

If any of the marbles are blue then the probabilities are 0

8 0
4 years ago
Help it is so hard.And my teacher expects it done.
creativ13 [48]
If you can take a better picture of it I will be able to answer the questions for you
3 0
3 years ago
Find the diameter of a circle with an area of 6767 square centimeters.
scZoUnD [109]
  • Area=6767cm²

Diameter be d

Radius be r

  • πr²=6767
  • r²=6767/π
  • r²=2155
  • r=46.4cm

Diameter=2r=46.4(2)=92.8cm

6 0
2 years ago
Read 2 more answers
What is the greatest common factor of 24, 18, and 36?
slava [35]

Answer:

most likely 6

Step-by-step explanation:

because factors of 36 is 4,2,6 etc factors of 18 is 6 and 24 and it the gcf

8 0
3 years ago
Read 2 more answers
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