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inna [77]
3 years ago
7

30.10

Mathematics
1 answer:
Nookie1986 [14]3 years ago
5 0

Answer:

4/21

Step-by-step explanation:

It should be a porpotion

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Evaluate the summation of negative 2 n minus 3, from n equals 2 to 10..
Alisiya [41]
\bf \sum\limits_{n=2}^{10}~-2n-3

so, let's first change the bounds from 1 to 9, so we'll be dropping the indices by 1, in order to do the variable "n".

however, let's use a variable hmmm say "k", where "k" is the value of "n" beginning at 1, thus k = n - 1.

however, if k = n - 1, then k + 1 = n.  So let's use those fellows then,

\bf \sum\limits_{n=2}^{10}~-2n-3\qquad 
\begin{cases}
k=n-1\\
k+1=n
\end{cases}\implies \sum\limits_{k=1}^{9}~-2\stackrel{n}{(k+1)}-3
\\\\\\
\sum\limits_{k=1}^{9}~-2k-2-3\implies \sum\limits_{k=1}^{9}~-2k-5\implies \sum\limits_{k=1}^{9}~-2k-\sum\limits_{k=1}^{9}~5
\\\\\\
-2\sum\limits_{k=1}^{9}~k-\sum\limits_{k=1}^{9}~5\implies -2\left( \cfrac{9(9+1)}{2} \right)\qquad -\qquad (9\cdot 5)
\\\\\\
-2(45)-45\implies -90-45\implies -135
5 0
3 years ago
All I need to know is if I picked the right one!
Lemur [1.5K]

Answer:

No! The answer is not zero. There can be infinite solutions for this equation.

Hope it helps!

7 0
3 years ago
Read 2 more answers
1.) The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. What is the approxi
const2013 [10]

Answer:

c .3.3

Step-by-step explanation:

pH is the negative log of the molar hydrogen ion concentration.The equation to calculate pH is;

pH = -log10[H+]

pH = -log10(5.0 x 10-4)

pH = 3.30

6 0
2 years ago
Read 2 more answers
If the perimeter of a circular ground is 308 M find its radius​
crimeas [40]

Answer:

Correct option is

A

49m

The circumference of a circular field is 308m

Therefore, 2πr=308

⇒r=

2×22

308×7

⇒r=49m

Step-by-step explanation:

here you go

3 0
2 years ago
Read 2 more answers
Given 6(x) = (x+41, what is b(-10)?
prisoha [69]

The value of b(-10) is 31

Explanation:

The given expression is b(x)=x+41

We need to determine the value of b(-10)

The value of b(-10) can be determined by substituting x=-10 in the expression b(x)=x+41

Thus, we have,

b(-10)=-10+41

Adding the terms, we have,

b(-10)=31

Thus, the value is 31.

Therefore, the simplified value of the expression by substituting x=-10 in the expression b(x)=x+41 is 31.

7 0
3 years ago
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