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3 years ago

Prove the identity. cosh(−x) = cosh(x)

Mathematics

1 answer:

mars1129 [50]3 years ago

6 0

Answer C

Step-by-step explanation: lol idk

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PLEASE PLEASE PLEASE HELP I really don’t understand this.

Amiraneli [1.4K]

Answer:

The second option is the answer.

Step-by-step explanation:

Do f(x) first, and then plug that into g(x).

$f(x)=\sqrt{x+3}$

$(g o f)(x) = \frac{\sqrt{x+3}^{2}+2 }{\sqrt{x+3}}=\frac{x+5}{\sqrt{x+3}}$

3 0

3 years ago

The current (I) varies directly as the voltage (V) in an electric circuit. If the current is 4 amperes when the voltage is 100 v

Margarita [4]

$\bf \begin{array}{cccccclllll}
\textit{something}&&\textit{varies directly to}&&\textit{something else}\\ \quad \\
\textit{something}&=&{{ \textit{some value}}}&\cdot &\textit{something else}\\ \quad \\
y&=&{{ k}}&\cdot&x
\\
&& y={{ k }}x
\end{array}\\\\
-----------------------------\\\\$

$\bf \textit{l varies directly to V}\implies l=kV
\\\\\\
\textit{now, we also know that }
\begin{cases}
l=4\\
V=100
\end{cases}\implies 4=k100
\\\\\\
\cfrac{4}{100}=k\implies \cfrac{1}{25}=k\impliedby \textit{constant of variation}
\\\\\\
thus\implies l=\cfrac{1}{25}V
\\\\\\
\textit{what is the current when the voltage is 75?}\qquad l=\cfrac{1}{25}\cdot 75$

6 0

3 years ago

Pls help pls pls pls pls pls I beg u pls

Umnica [9.8K]

Answer:

4a. S = 300c

4b. S = 2400

Step-by-step explanation:

4a. There are 300 seats in a conference room 'c' so to find the amount of seats there are in total you need to times these values so...

S = 300c

4b. substituting 8 into c gets

S = 300x8

S = 2400

hope this helps!

5 0

3 years ago

While catching fireflies, you and a friend decide to have a competition. After m minutes, you have (3m+13) fireflies and your fr

scoundrel [369]

Answer:

7m + 19 should be the answer

Step-by-step explanation:

total 7m + 19

3 0

3 years ago

I need help on question 21. can u help me

loris [4]

Answer:

11.7

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers