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egoroff_w [7]
2 years ago
7

What is 5x - 20 + 2x -7

Mathematics
1 answer:
Marrrta [24]2 years ago
5 0
5x -20 + 2x -7
= 5x + 2x -20 -7
= 7x -27
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Four children have small toys. The first child has 1/10 of the toys, the second child has 12 more toys than the first, the third
GREYUIT [131]
Let the total toys be x.

The first has (1/10)x =  x/10


The third child has one more toys than the first =  x/10  + 1

The fourth has double of the third:  =  2* (x/10 + 1)  =  2x/10 + 2


Since we know that the second child has 12 more toys than the first

Therefore the Second  minus First = 12.


First let us find the second.

1st + 2nd + 3rd + 4th = x

x/10   +  2nd +  (x/10 + 1) + (2x/10 + 2) = x

2nd + x/10  + x/10 + 1 + 2x/10 + 2 = x

2nd + x/10 + x/10 + 2x/10 + 1 + 2  = x

2nd + 4x/10 + 3 = x

2nd = x - 4x/10 - 3

2nd =  6x/10  - 3

But recall

2nd - 1st = 12

6x/10 - 3 - x/10 = 12

6x/10 - x/10 = 12 + 3

5x/10 = 15

5x =  15 * 10

x  = 15*10 /5

x = 30

So there were 30 toys in all.
3 0
3 years ago
Solve by substitution or elimination;<br><br> x+2y=-1<br> x-y=5
Strike441 [17]
I would love to use substitution (It is simplier that way I guess)

solve your system of equations.

x+2y=−1;x−y=5

Solve x+2y=−1 for x:

x+2y+−2y=−1+−2y(Add -2y to both sides)

x=−2y−1

Substitute (−2y−1) for x in x−y=5:

x−y=5

−2y−1−y=5

−3y−1=5(Simplify both sides of the equation)

−3y−1+1=5+1(Add 1 to both sides)

−3y=6

−3y/−3 = 6/−3(Divide both sides by -3)

y=−2

Substitute (−2) for y in x=−2y−1:

x=−2y−1

x=(−2)(−2)−1

x=3(Simplify both sides of the equation)

So the answer is (x = 3 and y = -2)

7 0
3 years ago
Read 2 more answers
Please help meeee, thank youuuu
Margarita [4]

Answer:

45

Step-by-step explanation:

I think so i dont know

3 0
2 years ago
Read 2 more answers
Help!!!ASAP!!!PLZ!!!
noname [10]

You find the least common multiple of the two denominators, then you multiply whatever you multiplied to the denominator to the numerator to get to the LCM.

ex:

3/4 + 2/3 --> 9/12+ 8/12= 17/12

7 0
3 years ago
I need help with p=2l+2w and solve for w
xxMikexx [17]

remember, you can do anything to an equation as long as you do it to both sides

try and isolate the variable you are solving for and divide it by its constant


p=2l+2w

minus 2l from both sides

p-2l=2w

divide both sides by 2

\frac{p-2l}{2}=w

w=\frac{p-2l}{2}=w

which can also be simplified to

w=\frac{p}{2}-l

8 0
3 years ago
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