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3 years ago

Mathematics I need help please

Mathematics

1 answer:

mel-nik [20]3 years ago

7 0

5 1/7 x 1/9= 36/7 ×1/9= 4/7

8-3/2= 8-1 1/2= 7 1/2

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Which equation represents a linear function?

Stella [2.4K]

The answer is equation 2. The reasoning is because a linear function is y=mx+b
therefore, y=8x+1 seems to be very close.

3 0

4 years ago

How do i solve this differential equation y'=2y-x over 2x-y

Tamiku [17]

$y'=\dfrac{2y-x}{2x-y}$

Let $y=xv$ , where $v=v(x)$ , so that $y'=xv'+v$ . Then the ODE is

$xv'+v=\dfrac{2xv-x}{2x-xv}$
$xv'=\dfrac{2x(v-1)}{x(2-v)}-v$
$xv'=\dfrac{2(v-1)}{2-v}-\dfrac{v(2-v)}{2-v}$
$xv'=\dfrac{v^2-2}{2-v}$

This is separable, so you have

$\dfrac{2-v}{v^2-2}\,\mathrm dv=\dfrac{\mathrm dx}x$

Integrate both sides, solving for $v$ if possible, then replace using $v=\dfrac yx$ and solve for $y$ if possible.

3 0

3 years ago

Jaime has 5 over 11 spaceof a project completed while Tim has finished 7 over 13 spaceof the same project.

faust18 [17]

Answer:

a. Tim has completed a greater amount of work.

b. Together they have completed $\frac{142}{143}$ part of two projects.

Step-by-step explanation:

Let us assume that the project on which Jaime and Tim are working has x amount of space.

Now, given that Jaime has 5 over 11 space of a project completed while Tim has finished 7 over 13 space of the same project.

Therefore, Jaime has completed $\frac{5x}{11}$ amount of space and Tim has finished $\frac{7x}{13}$ amount of space.

a. Now, (7x) \times 11 > (5x) \times 13

⇒ $\frac{7x}{13} > \frac{5x}{11}$

Therefore, Tim has completed the greater amount of work. (Answer)

b. Together they have completed $(\frac{7x}{13} + \frac{5x}{11}) = \frac{(7 \times 11 + 5 \times 13)}{13 \times 11} x = \frac{142}{143}x$ amount of space out of 2x amount of space. (Answer)

4 0

3 years ago

25% of what number is 329? Round to one decimal place.

natka813 [3]

Answer:

<h3>The number is 1316</h3>

Step-by-step explanation:

Let the unknown number be x

$25\% \times x = 329\\\\\frac{25}{100} \times x =329\\\\\frac{25x}{100} =329\\\\Cross\:Multiply\\25x = 32900\\\\Divide\:both\:sides\:by\:25\\\\\frac{25x}{25} =\frac{32900}{25} \\\\x =1316$

5 0

3 years ago

The half-life of Radium-224 is

Sholpan [36]

Answer:

10.98 days is 10.98/3.66 = 3 half life periods and half of the mass is lost at each half life. You can do this in your head. I have!!

Step-by-step explanation:

8 0

2 years ago