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Tanya [424]
4 years ago
10

What’s 18 divided by 7?

Mathematics
1 answer:
GalinKa [24]4 years ago
7 0

Here is the answer...

2.57142857143  


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Determine whether or not 630 is a triangular number. start with the formula t n = n ( n + 1 ) 2 and then use the quadratic formu
ziro4ka [17]
Triangular sequence = n(n + 1)/2

If 630 is a triangular number, then:

n(n + 1)/2  = 630

Then n should be a positive whole number if 630 is a triangular number.

n(n + 1)/2  = 630

n(n + 1)  = 2*630

n(n + 1)  = 1260

n² + n = 1260

n² + n - 1260 = 0

By trial an error note that 1260 = 35 * 36

n² + n - 1260 = 0

Replace n with 36n - 35n

n² + 36n - 35n - 1260 = 0

n(n + 36) - 35(n + 36) = 0

(n + 36)(n - 35) = 0

n + 36 = 0   or   n - 35 = 0

n = 0 - 36,   or  n = 0 + 35

n = -36, or 35

n can not be negative. 

n = 35 is valid.

Since n is a positive whole number, that means 630 is a triangular number.

So the answer is True.
7 0
3 years ago
What is 10^{2} /19^{4}
MatroZZZ [7]

Answer:

\frac{100}{130321}

Step-by-step explanation:

10² ÷ 19^{4}

100 ÷ 19^{4}

100 ÷ 130321

\frac{100}{130321}

4 0
3 years ago
PLEASE HELP ME!!!!!!
inna [77]

Answer:

6 + x - y

Step-by-step explanation:

6 + x - y is a trinomial of degree 1.

8 0
3 years ago
What is 5 8/12 as a mixed number in simplest form​
zheka24 [161]

Answer:

5 8/12 gives 68/12

Step-by-step explanation:

EXPLANATION:

5 8/12

first you multiply

12×5=60

Now

you add 60 with8

60+8=68

so the answer is :

68/12

5 0
3 years ago
Read 2 more answers
Joe buys a set of books that cost $45.58. He gives the cashier three (3) $20 bills and three (3) pennies. How much change should
Leya [2.2K]
Joe should get $14.45 back. 

This is because you must subtract the total cost from the total amount given. If we add the 3 $20 bills together, we get $60. Then is we add the 3 pennies together we get .03. If we add those two both together we get a total of $60.03.

Now we must subtract the cost given from the overall dollar given: 

60.03 - 45.58 = 14.45 
5 0
3 years ago
Read 2 more answers
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