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2 years ago

Please, I need this ASAP. Find the value of x.

Mathematics

1 answer:

ira [324]2 years ago

4 0

Answer:

x = $12\sqrt{2}$

Step-by-step explanation:

Cos 45= 12/x

x=12/Cos 45

$x=\frac{12}{\frac{\sqrt{2}}{2}}$

$x=\frac{24}{\sqrt{2}}$

x= $12\sqrt{2}$

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Your laptop battery will last for exactly 6 hours before it needs to be recharged.You have had your laptop on for

diamong [38]

Answer:

$3\frac{1}{2} hours$

Step-by-step explanation:

You have to subtract 2 1/2 from 6 and that will equal 3 and 1/2.

5 0

2 years ago

Someone please help quickly :(

postnew [5]

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2 years ago

Read 2 more answers

Which of the following matrices is the solution matrix for the given system of equations? x + 5y = 11 x - y = 5

givi [52]

<h2>The required solution is x = 6 and y = 11 </h2>

Step-by-step explanation:

Given system of equations are

x+5y = 11 and x-y =5

$A= \left[\begin{array}{cc}1&5\\1&-1\end{array}\right]$ $X=\left[\begin{array}{c}x\\y\end{array}\right]$

and $B= \left[\begin{array}{c}11\\5\end{array}\right]$

∴AX=B

$adj A = \left[\begin{array}{cc}{-1}&{-5}\\{-1}&1\end{array}\right]$

$A= \left|\begin{array}{cc}1&5\\1&-1\end{array}\right|=-6$

∴ $A^{-1} =\frac{adj A}{|A|}$

So, $A^{-1} =\frac{ \left[\begin{array}{cc}{-1}&{-5}\\{-1}&1\end{array}\right]}{-6}$

$A^{-1} ={ \left[\begin{array}{c \c} {{\frac{1}{6} }}&{\frac{5}{6}}\ \\ {{\frac{1}{6} }}&{\frac{-1}{6}} \end{array}\right]}$

$X =A^{-1}\times B$

⇒ $\left[\begin{array}{c}x\\y\end{array}\right] ={ \left[\begin{array}{c \c} {{\frac{1}{6} }}&{\frac{5}{6}}\ \\ {{\frac{1}{6} }}&{\frac{-1}{6}} \end{array}\right]} \times \left[\begin{array}{c}11\\5\end{array}\right]$

⇒ $\left[\begin{array}{c}x\\y\end{array}\right] ={ \left[\begin{array}{c} {6}\\ {11} \end{array}\right]}$

∴ x= 6 and y = 11

The required solution is x = 6 and y = 11

7 0

2 years ago

#14 write the given sentence as an equation. Tim'S age in 7 years will be three times what it was 19 years ago

kobusy [5.1K]

The first thing we must do for this case is to define variables.
We have then:
x = Tim's age
Now we write the equation:
x + 7 = 3 (x-19)
Answer:
Tim's age in 7 years will be three times what it was 19 years ago:
x + 7 = 3 (x-19)

3 0

2 years ago

David has 16 skate wheels, which he is putting on 4 boards to go with the 3 boards he has. How many boards does he have altogeth

Aleksandr-060686 [28]

He has a total of 7 Boards. he has 3 boards of his own and then you add the 4 additional boards that he has

4 0

3 years ago