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Natali [406]
4 years ago
13

Seven added to double a number

Mathematics
1 answer:
valentinak56 [21]4 years ago
7 0
<h3>Correct Question :</h3>

Express in arithmetic :

Seven added to double a number.

<h3>Solution :</h3>

Let the unknown be x.

Then, double of the number = 2x.

Atq,

2x+7

Hence,seven added to double a number = 2x+7

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Find two unit vectors orthogonal to both given vectors. i j k, 4i k
Maurinko [17]
The cross product of two vectors gives a third vector \mathbf v that is orthogonal to the first two.

\mathbf v=(\vec i+\vec j+\vec k)\times(4\,\vec i+\vec k)=\begin{vmatrix}\vec i&\vec j&\vec k\\1&1&1\\4&0&1\end{vmatrix}=\vec i+3\,\vec j-4\,\vec k

Normalize this vector by dividing it by its norm:

\dfrac{\mathbf v}{\|\mathbf v\|}=\dfrac{\vec i+3\,\vec j-4\,\vec k}{\sqrt{1^2+3^2+(-4)^2}}=\dfrac1{\sqrt{26}}(\vec i+3\,\vec j-4\vec k)

To get another vector orthogonal to the first two, you can just change the sign and use -\mathbf v.
6 0
3 years ago
What are the answers​
LUCKY_DIMON [66]

Answer:

Step-by-step explanation:

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7 0
3 years ago
Q20<br> y varies directly as the square of (x – 3).<br> y= 16 when x=1.<br> Find y when x= 10.
enot [183]
-56


Mark brainliest please


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3 0
3 years ago
While shopping for a dress, mrs vargas found one that was in sale for 35% off. the original price was $40. how much will she sav
timurjin [86]
Answer: $14

Steps:
What if 35% of $40
35% of 40
35% * 40
0.35 * 40 = $14

She will save $14

Tips:
-The word “of” means multiply
-To change a percent to a decimal move the decimal 2 places to the left.

If this was helpful and correct I would appreciate the brainliest! :)
3 0
3 years ago
Sara has $150 in her savings account. The amount in her account increases by %6 every year. If she does not put more money into
strojnjashka [21]

Answer:

$159

Step-by-step explanation:

we know that

The equation of a exponential growth function is equal to

y=a(1+r)^x

where

y is the balance in the saving account

x is the number of years

a is the initial amount

r is the percent rate of change

we have

a=\$150\\r=6\%=6/100=0.06

substitute

y=150(1+0.06)^x

y=150(1.06)^x

For x= 1 year

substitute

y=150(1.06)^1=\$159

3 0
4 years ago
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