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2 years ago

(2x+3y)+(4x+9y) how do I simplify it

Mathematics

2 answers:

Aleksandr-060686 [28]2 years ago

8 0

Answer: the answer is 6x + 12y

Step-by-step explanation:

Pachacha [2.7K]2 years ago

4 0

6x+12y will be the answer for this!

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Solve the equation -20=-4x-6x

IrinaK [193]

-20=-4x-6x
4x+6x=20
10x=20
x=20:10
x=2

proof:
-20=-4×2-6×2
-20=-8-12
(-8)+(-12)=-20

4 0

2 years ago

Marco is 8 years younger than his brother Paolo. If their product of their ages is 105, how old is Marco? plz help

Nina [5.8K]

Answer:

Marco's age is 7 years old

Step-by-step explanation:

Let

x ----> Marco's age

y ----> Paolo's age

we know that

$x=y-8$ ----> $y=x+8$ ----> equation A

$xy=105$ ----> equation B

substitute equation A in equation B

$x(x+8)=105$

$x^2+8x-105=0$

Solve the quadratic equation

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^2+8x-105=0$

$a=1\\b=8\\c=-105$

substitute in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(-105)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{484}} {2}$

$x=\frac{-8(+/-)22} {2}$

$x=\frac{-8(+)22} {2}=7$

$x=\frac{-8(-)22} {2}=-15$

Remember that the solution cannot be a negative number

The solution is x=7

therefore

Marco's age is 7 years old

4 0

3 years ago

Given right triangle ABC with altitude BD draw to hypotenuse AC. If AD=13 and DC=33,what is the length of BD in simplest radical

denis23 [38]

Answer:

8.06

Step-by-step explanation:

I used my brain and paper. I don't want to have to explain it anymore sorry but yes I think that is the right answer.

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2 years ago

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jok3333 [9.3K]

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2 years ago

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How do you find the slope of a line?<br><br> (Change in Y / Change in X)

sukhopar [10]

In order to find the slope of a line, u must use the slope formula. Which is (y2-y1/x2-x1). For example if you had a set of coordinates that are (6,4) and (2,8) you would first sub the 8 from4 which gives you 4. The u do the same with 2 and 6 which gives u 4. After that you divide 4 by 4. and your answer is 1

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2 years ago

(2x+3y)+(4x+9y) how do I simplify it​

(2x+3y)+(4x+9y) how do I simplify it