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alexandr402 [8]

3 years ago

7

2n + 4n = 42 Answer: the value of n is .....

2 answers:

jeka57 [31]3 years ago

7 0

Answer: 7

Step-by-step explanation:

4x7= 28 and 2x7=14

14+28= 42

Gennadij [26K]3 years ago

5 0

Answer:

7

Step-by-step explanation:

2n + 4n = 6n, adding like terms

6n = 42

6n/6 = 42/6

n = 7

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Hey! please help posted picture of question

lara31 [8.8K]

The answer is D) 2

Since it is given that there have been 9 slices eaten, we can assume that whatever amount of slices were cut in total will have 9 reduced from the amount. With the fraction 2/11, we know 11-9=2, which fits perfectly into this description so 2 slices have not been eaten.

3 0

3 years ago

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How do you express sin x + cos x in terms of sine only?

frez [133]

Answer:

$\sin x + \sqrt{1-\sin^2x}$

Step-by-step explanation:

Given: sin x + cos x

To change the given trigonometry expression in term of sine only.

Trigonometry identity:-

$\sin^2x+\cos^2x=1$
$\cos x=\sqrt{1-\sin^2x}$

Expression: $\sin x+\cos x$

We get rid of cos x from expression and write as sine form.

Expression: $\sin x + \sqrt{1-\sin^2x}$ $\because \cos x=\sqrt{1-\sin^2x}$

Hence, The final expression is only sine function.

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4 years ago

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Oliga [24]

Answer:

C

Step-by-step explanation:

4 0

3 years ago

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Evaluate (a - 4b)2 + 2a if a = 15 and b = 3.

jok3333 [9.3K]

Answer:

9

Step-by-step explanation:

(a-b)^2=a^2-2ab+b^2

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3 0

1 year ago

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Despejar la variable <br> 2x al cuadrado + 15= 113

Rudik [331]

Hola!

x = 7 , x = -7

Explicación:

Comienza restando 15 en cada lado:

$2x^{2} + 15 -15=113-15$

Usted obtiene:

$2x^{2} =98$

Ahora divide ambos lados por 2:

$\frac{2x^{2} }{2} =\frac{98}{2}$

Usted obtiene:

$x^{2} =49$

Como la ecuación está al cuadrado, tendrás que hacer:

$x=\sqrt{f(a)} , x=-\sqrt{f(a)}$

que te da: $x=\sqrt{49} , x =-\sqrt{49}$

Entonces:

$\sqrt{49}=7 , -\sqrt{49} = -7$

6 0

3 years ago