All categories

3 years ago

Plsssss helppp im so lost on this

Mathematics

1 answer:

Alik [6]3 years ago

3 0

Answer:

2n-4>1n+3

Step-by-step explanation:

So basically 2 times a number go together because it means its multiplying and the greater sign is > and then 1 is multiplying with n so its 1n and then you just add 1

You might be interested in

X = 2y-2<br> 4x-9 = 11<br><br> Step by step please

Alex787 [66]

Answer x=5, y= 3.5

Find y by plugging the x value into the 2nd equation
4(2y-2) -9=11
8y - 8 - 9 =11 combine like terms
8y = 28 divide both sides by 8
y = 3.5

Now find x
Plug your y value into first equation
X = 2(3.5) -2
X= 7-2
X=5

You can check your work by putting your x or y values into the equations

For the first equation
5=2(3.5) -2
5=5

For the second equation
4(5) -9 = 11
20 - 9 = 11
11 =11

4 0

1 year ago

Help solve mathematics question, please. Photo.

cricket20 [7]

Hi Mark

3x+y=4

2x+y=5

Solve 3x+y=4 for y

Add -3x to both sides

3x+y-3x=4-3x

y=-3x+4

Substitute -3x+4 for y in 2x+y=5

2x+y=5

2x-3x+4=5

Simplify both sides of the equation

-x+4=5

Add -4 to both sides

-x+4-4=5-4

-x=1

Divide both sides by -1

-x/-1= 1/-1

x=-1

Substitute -1 for x in y=-3x+4

y=-3x+4

y=(-3)(-1)+4

Simplify both sides of the equation

y=7

Answer: (-1,7)

I hope that's help ! Have a great weekend :)

3 0

3 years ago

What is 2 divided by 1/4

soldi70 [24.7K]

8 is the answer!

Turn 1/4 into a decimal then divide 2 by .25

7 0

3 years ago

Read 2 more answers

. If sin(x + y)=sin x.cos y+cos x.sin y, then find the value of sin 75 degrees

miv72 [106K]

Answer:

$\sf \dfrac{\sqrt{6}+\sqrt{2}}{4}$

Step-by-step explanation:

<h3>Trigonometry:</h3>

75 = 45 + 30

Sin (x + y) = Sin x *Cos y + Cos x * Sin y

Sin (45 + 30) = Sin 45 * Cos 30 + Cos 45 * Sin 30

$\sf =\dfrac{1}{\sqrt{2}}*\dfrac{\sqrt{3}}{2}+\dfrac{1}{\sqrt{2}}* \dfrac{1}{2}\\\\\\=\dfrac{\sqrt{3}}{2\sqrt{2}}+\dfrac{1}{2\sqrt{2}}\\\\\\=\dfrac{\sqrt{3}*\sqrt{2}}{2*\sqrt{2}*\sqrt{2}}+\dfrac{1*\sqrt{2}}{2\sqrt{2}*\sqrt{2}}\\\\\\=\dfrac{\sqrt{6}}{2*2}+\dfrac{\sqrt{2}}{2*2}\\\\\\=\dfrac{\sqrt{6}+\sqrt{2}}{4}$

7 0

1 year ago

Jill picks a number at random and multiplies it by 2 and adds five to the product. She then multiplies the sum by -3 and subtrac

Strike441 [17]

Answer:

Step-by-step explanation:

Say Jill picks the number x.

She multiplies it by 2 giving 2x.

It says add 5 to that product giving 2x+5.

She multiplies this sum by -3 giving -3(2x+5).

She then subtracts 7 from that product giving -3(2x+5)-7.

Her number after doing all of this is -40 so we hae -3(2x+5)-7=-40

To solve:

First: I would add 7 on both sides: -3(2x+5)=-33

Second: I would divide boht sides by -3: 2x+5=11

Third: I would subtract 5 on both sides: 2x=6

Last: I would divide both sides by 2: x=3

7 0

3 years ago