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Gnom [1K]
3 years ago
11

K/9 = 2/5. Solve for k. I will give you brainliest answer

Mathematics
2 answers:
lesya692 [45]3 years ago
8 0
   k = 18/5 = 3.600.........
denis-greek [22]3 years ago
3 0
This is a proportion. To solve a proportion, cross multiply

K x 5 = 5k

2 x 9 = 18

5k = 18

Perform the opposite operation to isolate k by dividing both sides of the equation by 5

k= \frac{18}{5}
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Solve the following quadratic equation by completing the square: x² + 12x = 15
Lerok [7]
Answer:

x = -1.14 or -13.14

Explanations:

The given equation is:

x^2+12x\text{  =  15}

Find the half of 12, and add the square to both sides of the equation.

That is add 6² to both sides

x^2+12x\text{ + 6}^{2}\text{  =  15 + 6}^{2}\begin{gathered} (x+6)^2\text{ =  15  +  3}6 \\ (x+6)^2\text{ = 51} \\  \end{gathered}

Find the square root of both sides:

\begin{gathered} \sqrt[]{(x+6)^2_{}}=\pm\sqrt[]{51} \\ \text{x  +  6  = }\pm\sqrt[]{51} \\ x\text{  =  -6  }\pm\sqrt[]{51} \\ \text{x  = }-6\pm7.14 \\ x\text{  = -6+7.14  = }1.14 \\ x\text{ = -6 - 7.14} \\ \text{x = -13.14} \end{gathered}

x = -1.14 or -13.14

3 0
9 months ago
Refer to the figure below to complete the following item. Given: Quadrilateral ROSE is trapezoid with median If MN = 24 and ES =
STatiana [176]
<span>18 is you answer. Hope this helps.</span>
4 0
3 years ago
Read 2 more answers
I need help on #1 #3 #4
mr_godi [17]

1.) Word form: two hundred thirty-six and seventy-seven thousandths

Expanded notation:   200   + 30   + 6 +     0.0   + 0.07  + 0.007

There are no underlines?

3.) tenth: 7.3 hundredth: 7.31 thousandth: 7.305 whole number: 7

4.) Estimate: 10,400

Answer is 10,417



5 0
2 years ago
Read 2 more answers
When a person is breathing normally the amount of air in their lawns varies sinusoidally. When full Karen’s lungs hold 2.8 L of
makkiz [27]

Answer:

A(t) = 2.2\sin \frac{(t - 2)\pi }{6} + 0.6

Step-by-step explanation:

Let the function of quantity in the lung of air be A(t)

So A(t) \alpha \sin (\frac{t - \alpha }{k} )

so, A(t) = Amax sin t + b

A(t) = 2.8t⇒ max

A(t) = 0.6t ⇒ min

max value of A(t) occur when sin(t) = 1

and min value of A(t) = 0

So b = 0.6

and A(max) = 2.2

A(t) = 2.2\sin \frac{(t)}{k} + 0.6

at t = 2 sec volume of a is 0.6

So function reduce to

A(t) = 2.2\sin \frac{(t - 2)}{k} + 0.6

and t = 5 max value of volume is represent

so,

\sin \frac{t - \alpha }{k} = 1

\frac{t - 2}{k} = \frac{\pi }{2} when t = 5

\frac{6}{\pi } = k

so the equation becomes

A(t) = 2.2\sin \frac{(t - 2)\pi }{6} + 0.6

7 0
3 years ago
Here is an inequality: -2x&gt;10
jek_recluse [69]

Answer:

The right solution is "x>-5".

Step-by-step explanation:

The given inequality is:

⇒ -2x>10

By solving the above expression, we get

⇒ x >-\frac{10}{2}

⇒ x>-5

Thus the above is the correct answer.

7 0
2 years ago
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