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olga55 [171]
4 years ago
9

Find a • b. a = 4i + 8j, b = -2i + 3j

Mathematics
2 answers:
denis-greek [22]4 years ago
5 0
U set them equal to each other like,
a=b
4i + 8j = -2i + 3j
+2i +2i
u cancel the ones that equal to 0.
4i + 2i + 8j = 3j
-8j. -8j
4i + 2i = 3j - 8j
6i = -5j answer
My name is Ann [436]4 years ago
3 0
\bf \begin{cases}
a=4i+8j\\
b=-2i+3j
\end{cases}\implies 
\begin{cases}
a=\ \textless \ 4,8\ \textgreater \ \\
b=\ \textless \ -2,3\ \textgreater \ 
\end{cases}\\\\
-------------------------------\\\\
\textit{dot product for }\ \textless \ a,b\ \textgreater \ \cdot \ \textless \ c,d\ \textgreater \ \implies (a\cdot c)+(b\cdot d)\\\\
-------------------------------\\\\
a\cdot b\implies (4\cdot -2)+(8\cdot 3)\implies -8+24\implies \boxed{16}
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I'm unsure how to solve this, if you can please respond asap. Thanks!
Alinara [238K]

Answer:

82.5°

Step-by-step explanation:

This is the case of a isosceles triangle , as you may know in a isosceles triangle , there are two sides of equal length as well as two equal angles.

You know that the sum of angles in a triangle is 180°, therefore it comes to this equation :

15° + 2x = 180°

2x = 165°

x = 82.5°

therefore 82.5° is the correct answer.

4 0
3 years ago
Help me please (show work)
garri49 [273]

9514 1404 393

Answer:

  14.  53.1°

  16.  253.7°

Step-by-step explanation:

14. The measure of angle L can be found from the cosine relation:

  Cos = Adjacent/Hypotenuse

  cos(L) = 9/15 = 3/5

  L = arccos(3/5) = 53.1° . . . arc MK

__

16. Arc MK is half of arc JK, so that arc is 106.3°. The long arc JPK is the difference between 360° and the measure of the short arc JK.

  360° -106.3° = 253.7° . . . arc JPK

6 0
3 years ago
10 2/3 + 2h < 4 1/3.
Snezhnost [94]
Well i got -19/6 but if you simplify it it would be -3.16667
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4 years ago
The area of a rectangle having breadth is 2.6m is 18.33 sq.m. Find the<br> length of the rectangle.
uysha [10]

Answer:

Hight=7.04mt

Step-by-step explanation:

The area of a rectangle is the result of multiply two touching sides

Area=Length*Heght (1)

We have one its sides (2,6m).

The other side can be otained using the equation (1) where Area= 18.33 sqm

18.3sqm=2.6m* Height

Lets divide the whole expression by 2.6m

18.3 sqm / 2.6 m= 2.6m * Height

Hight=7.04mt

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3 years ago
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Harlamova29_29 [7]

Answer:

4. I think its d

Step-by-step explanation:

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