1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Yuri [45]
3 years ago
14

Number sense which subtraction  sentences show you how to find 15- 7

Mathematics
1 answer:
Mars2501 [29]3 years ago
6 0
You can use addition to solve this problem. 7+_= 15
You might be interested in
What is the value of x?
gulaghasi [49]
I believe the answer is X=15
8 0
3 years ago
Read 2 more answers
A teacher places n seats to form the back row of a classroom layout. Each successive row contains two fewer seats than the prece
Alex_Xolod [135]

Answer:

The number of seat when n is odd S_n=\frac{n^2+2n+1}{4}

The number of seat when n is even S_n=\frac{n^2+2n}{4}

Step-by-step explanation:

Given that, each successive row contains two fewer seats than the preceding row.

Formula:

The sum n terms of an A.P series is

S_n=\frac{n}{2}[2a+(n-1)d]

    =\frac{n}{2}[a+l]

a = first term of the series.

d= common difference.

n= number of term

l= last term

n^{th} term of a A.P series is

T_n=a+(n-1)d

n is odd:

n,n-2,n-4,........,5,3,1

Or we can write 1,3,5,.....,n-4,n-2,n

Here a= 1 and d = second term- first term = 3-1=2

Let t^{th} of the series is n.

T_n=a+(n-1)d

Here T_n=n, n=t, a=1 and d=2

n=1+(t-1)2

⇒(t-1)2=n-1

\Rightarrow t-1=\frac{n-1}{2}

\Rightarrow t = \frac{n-1}{2}+1

\Rightarrow t = \frac{n-1+2}{2}

\Rightarrow t = \frac{n+1}{2}

Last term l= n,, the number of term =\frac{ n+1}2, First term = 1

Total number of seat

S_n=\frac{\frac{n+1}{2}}{2}[1+n}]

    =\frac{{n+1}}{4}[1+n}]

     =\frac{(1+n)^2}{4}

    =\frac{n^2+2n+1}{4}

n is even:

n,n-2,n-4,.......,4,2

Or we can write

2,4,.......,n-4,n-2,n

Here a= 2 and d = second term- first term = 4-2=2

Let t^{th} of the series is n.

T_n=a+(n-1)d

Here T_n=n, n=t, a=2 and d=2

n=2+(t-1)2

⇒(t-1)2=n-2

\Rightarrow t-1=\frac{n-2}{2}

\Rightarrow t = \frac{n-2}{2}+1

\Rightarrow t = \frac{n-2+2}{2}

\Rightarrow t = \frac{n}{2}

Last term l= n, the number of term =\frac n2, First term = 2

Total number of seat

S_n=\frac{\frac{n}{2}}{2}[2+n}]

    =\frac{{n}}{4}[2+n}]

     =\frac{n(2+n)}{4}

    =\frac{n^2+2n}{4}  

4 0
3 years ago
How do you know where to place the decimal point in the quotient when dividing decimals by a whole number
kvasek [131]
Always when division with fractions, always move the decimal to the left.
8 0
3 years ago
A mathematician works for t hours per day and solves p problems per hour, where t and p are positive integers and 1
Crazy boy [7]

Answer:

what's the question?

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Factor the expression 5x^2+24x-5
Black_prince [1.1K]
5x^2+24x-5 factored is: (5x - 1)(x + 5)
3 0
3 years ago
Other questions:
  • What is the measure of YB
    7·1 answer
  • How do i write 2 1/5 as a fraction
    14·2 answers
  • Does the graph of the function y–x2=9 intersect with the following axes? If the answer is ‘yes’, determine the coordinates of th
    7·1 answer
  • Apply the distributive property to factor out the greatest common factor.<br> 9+15=
    5·1 answer
  • A meal has 310 calories in 5 servings. Find the calories per serving.
    11·2 answers
  • Can someone help please. I’ll give brainleist.
    15·1 answer
  • Help me!!!!!!!!!plzzz​
    10·2 answers
  • I will give brainliest but please explain!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    11·2 answers
  • Which describes the correct procedure when converting a number from scientific notation to standard notation if the power of 10
    5·1 answer
  • Shelly paid $2.00 per kg for the item that weighs 25% of the total weight of the 4 items calculate the amount of money she paid
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!