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NeX [460]
3 years ago
5

There are 70 fish in the tank. Half of the fish have orange spots and 1/5 of the remaining fish have orange and black spots. How

many fish have orange and black spots?
Mathematics
1 answer:
Feliz [49]3 years ago
8 0

Answer:

7 orange and black fish

Step-by-step explanation:

a fifth of the remaining fish is 7 because you are doing 35*1/5. 35 is the remaining number of fish because already half of the other fish is 35 and they are orange

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If x2+y2 = 12 and x2-y2=18, what is the value of x4-y4?
nataly862011 [7]

Answer:

Step-by-step explanation: add the equations

2x² = 30

x² = 15

y² = 12 - 15

    = -3

x4 -y4 = 15² - (-3)²

           = 216

6 0
1 year ago
Solve for <br> n<br> nn.<br> 7<br> n<br> −<br> 4<br> =<br> 31
makkiz [27]

Answer: 5

Step-by-step explanation:

5x7=35

35-4=31

5 0
2 years ago
Read 2 more answers
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
If a*b means 2a + b , then what is 2*5 ?
NeX [460]

Answer:

9

Step-by-step explanation:

let a = 2

b = 5

2a + b

Substituting the values,

=> 2(2) + 5

=> 4 + 5

=> 9

3 0
3 years ago
At Dorothy's Hair Salon, 4 gallons of shampoo will last 3 weeks. She has 7 gallons of shampoo. How much more must she order if s
Katen [24]

Answer: 4x4=16-7=9gallons

She will order 9 gallons

Step-by-step explanation:

5 0
3 years ago
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