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3 years ago

Can someone help with numbers 10, 12 and 15 I need to write the phrase as an expression

Mathematics

2 answers:

Gwar [14]3 years ago

8 0

10. 2k+3
12. p-6
15. 5 divided by n

atroni [7]3 years ago

4 0

Step-by-step explanation:

The expressions for the above questions are given below:

$10) \: \: 2k + 3 \\ \\ 12) \: \: p - 6 \\ \\14) \: \: 5 \div n$

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Reika [66]

The answer is D) f(n) = f(n − 1) ⋅ 2

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Earth's radius is approximately 6400 km. What is the surface area & volume of the earth?

Tamiku [17]

Answer:

$SA=514,457,600\ km^{2}$

$V=1,097,509,546,667\ km^{3}$

Step-by-step explanation:

step 1

Find the surface area

we know that

the surface area of a sphere is equal to

$SA=4\pi r^{2}$

substitute

$SA=4 \pi (6,400)^{2}$

$SA=163,840,000 \pi\ km^{2}$

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step 2

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3 years ago

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Solve the system by using a matrix equation

Sergeu [11.5K]

Answer:

Option A is correct (17,11).

Step-by-step explanation:

6x - 9y = 3

3x - 4y =7

it can be represented in matrix form as $\left[\begin{array}{cc}6&-9\\3&4\end{array}\right] \left[\begin{array}{c}x\\y\end{array}\right] = \left[\begin{array}{c}3\\7\end{array}\right]$

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X= $\left[\begin{array}{c}x\\y\end{array}\right]$

B= $\left[\begin{array}{c}3\\7\end{array}\right]$

i.e, AX=B

or X= A⁻¹ B

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= (-24)-(-27)

= (-24) + 27 = 3

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A⁻¹ = $\left[\begin{array}{cc}-4&9\\-3&6\end{array}\right]$ /3

A⁻¹ = $\left[\begin{array}{cc}-4/3&3\\-1&2\end{array}\right]$

X= A⁻¹ B

X= $\left[\begin{array}{cc}-4/3&3\\-1&2\end{array}\right] *\left[\begin{array}{c}3\\7\end{array}\right]$

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X= $\left[\begin{array}{c}-4+21\\-3+14\end{array}\right]$

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