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3 years ago

Using the sum or difference formulas,how do we find the exact value of sin (285°)?

Mathematics

1 answer:

Semenov [28]3 years ago

6 0

See attachment for the answer:

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Find an equation of the curve that passes through the point (0, 4) and whose slope at (x, y) is x/y.

jolli1 [7]

1/2y^2=1/2x^2+8. The curve's slope at (x,y) is x/y, so dy/dx=x/y. To solve this differential equation, rearrange it to: y*dy=x*dx, and by integrating both sides, we get 1/2y^2=1/2x^2+C (some constant). Plug in (0,4) into this equation, 8=0+C, so C=8. The curve's equation is 1/2y^2=1/2x^2+8.

4 0

3 years ago

Justin is asked to solve the following system of linear equations using the elimination method.

romanna [79]

Alright, lets get started.

Justin is asked to solve the linear equations using elimination method.

By using elimination method means we have to multiply some numbers in our given equations in such a way that the co-efficient of x or y become same in both equations so that we could add or subtract them to cancel one of the term either x or y.

So, given equations are :

$5x - 12 = 3$

$-20x + 14 y = 13$

See we have 5x in first equation and -20x in second equation.

So, we try to change 5x into 20 x by multiplying it with 4, both of the equations will have 20 x in common

Lets multiply 4 in first equation

$4 * (5x-12y) = 4 * 3$

$20x - 48y = 12$

Now both equations could be added and 20 x will be cancelled out and we could easily find the value of y then solve for x.

So, Justin should try to change 5 so that it will be cancels, so option B : Answer

Hope it will help :)

3 0

2 years ago

Please help me figure out what x is

mixas84 [53]

=12, I think, can I have Brainly

4 0

3 years ago

suppose the circumference of a crop circle is 150.7968 hectometers (hm) what's the radius of the circle? (usett=3.1416)

gulaghasi [49]

Answer:

The radius of the circle is $24\ hm$

Step-by-step explanation:

we know that

The circumference of a circle is equal to

$C=2\pi r$

In this problem we have

$C=150.7968\ hm$

$\pi=3.1416$

substitute and solve for r

$150.7968=2(3.1416)r$

$r=150.7968/(2(3.1416))=24\ hm$

7 0

3 years ago

Read 2 more answers

What is the mean median mode and range of the numbers 31 28 30 31 30 ...?

mamaluj [8]

1. Mean is the number you get when you add all these numbers and then divide by the number of numbers. So, (31 + 28 + 30 + 31 + 30) / 5 = 150 / 5 = 30
2. The median is the middle number in the list of numbers, so, the answer is 30 as well.
3. Mode is the number that appears most often, so here it is 30 and 31 because they both appear 2 times.
4. Range is the difference between the largest and smallest number, so 31 - 28 = 3.

5 0

2 years ago