3 years ago

Three more than twice the number

Mathematics

1 answer:

Alla [95]3 years ago

7 0

"More" means addition.

2n + 3

Hope this helps you!

You might be interested in

+ 9 y Find x when y = 6 and R = 7

rodikova [14]

Answer:

15 2/3

Step-by-step explanation:

R = 3x + 9y

7 = 3x + 9(6)

7 = 3x + 54

-47 = 3x

x = -15.6

5 0

3 years ago

5 times a number is less than 2 times that same number minus 9, what must be the value of the number?

zzz [600]

EQUATION: 5x = 2x - 9
Add 9 to both sides
NEW EQUATION: 5x + 9 = 2x
Subtact 5x from both sides:
NEW EQUATION: 9 = -3x
Divide -x on bith sides
NEW EQUATION: -3 = x, or x=-3

5 0

4 years ago

What is the volume of this prism? * 18 cm 6 cm 18 cm

astraxan [27]

There’s no picture to determine the column of the prism...

7 0

3 years ago

I need help with my fractions 9/14

inna [77]

Well 9/14 is already a simplified fraction :/ You will only get a decimal at this point :D

7 0

4 years ago

Prove whether the following are identities 2tanh 1/2x / 1−tanh^2 1/2 x = sinh x

Tanzania [10]

Recall that

$\cosh^2(x) - \sinh^2(x) = 1$

Dividing both sides by cosh²(x) gives

$1 - \tanh^2(x) = \mathrm{sech}^2(x)$

Also, recall the identity

$\sinh(2x) = 2\sinh(x)\cosh(x)$

Then

$\dfrac{2\tanh\left(\frac x2\right)}{1 - \tanh^2\left(\frac x2\right)} = \dfrac{2\tanh\left(\frac x2\right)}{\mathrm{sech}^2\left(\frac x2\right)} \\\\ \dfrac{2\tanh\left(\frac x2\right)}{1 - \tanh^2\left(\frac x2\right)} = 2\tanh\left(\dfrac x2\right)\cosh^2\left(\dfrac x2\right) \\\\ \dfrac{2\tanh\left(\frac x2\right)}{1 - \tanh^2\left(\frac x2\right)} = 2\sinh\left(\dfrac x2\right)\cosh\left(\dfrac x2\right) \\\\\dfrac{2\tanh\left(\frac x2\right)}{1 - \tanh^2\left(\frac x2\right)} = \sinh(x)$

4 0

3 years ago