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murzikaleks [220]
3 years ago
7

Please help me please show working answer but show work please

Mathematics
1 answer:
boyakko [2]3 years ago
8 0
Hello,

Below I attached directions and the answer :).

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What is the first of four consecutive numbers if their sum is 810?
Pachacha [2.7K]

Let x be the first of the four consecutive numbers.

Then x+1 is the second,

and x+2 is the third,

and x+3 is the fourth.

If their sum is 810, then

   x + x+1 + x+2 + x+3 = 810

If you solve that equation for x, you'll have the answer to your question.

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3 years ago
If there are x teams in a sports​ league, and all the teams play each other​ twice, a total of​ n(x) games are​ played, where ​n
EleoNora [17]
1.
Consider a group of n objects. Assume we want to form groups of r, from these n objects.

There are in total C(n, r)= \frac{n!}{r!(n-r)!} many ways of doing so.

where, r! is "r factorial", calculated as 1*2*3*...*(r-1)*r

2.

C(x, 2) is the total number of pairs out of x objects, that we can form.

so let the x objects represent the x teams, and 2, represent a group of 2, which means a game.

The total number of games is:

n(x)=2*C(x, 2) = 2*  \frac{x!}{2!(x-2)!}= \frac{x!}{(x-2)!}= \frac{x(x-1)(x-2)!}{(x-2)!}=x(x-1)= x^{2} -x

Remark, we multiplied by 2, since there will be 2 matches for each pair of teams.


Answer: x^{2} -x

6 0
3 years ago
Can some answer 4a. For me I think I got it wrong
Ierofanga [76]

Answer:

the correct answer is c

Step-by-step explanation:

4 0
3 years ago
Write an inequality that represents the real-world problem. Then select all that apply. Dominique’s bank balance was less than $
prohojiy [21]

Answer:

b<20

Step-by-step explanation:

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3 years ago
Read 2 more answers
3+ (5+4)= 3+ (4+5) illustrates which property? A.Commutative property of multiplication. B. dentity property of addition Associa
Sever21 [200]

Answer:

A, commutative

Step-by-step explanation:

Commutative property means that you can switch around the numbers, and get the same answer. However, the commutative property is only compatible for addition and multiplication. I.e. 2+6 equals 6+2, but 2-6 does not equal 6-2.

7 0
3 years ago
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