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Korolek [52]
2 years ago
7

Five times a number that has been decreased by 2 is equal to 55

Mathematics
2 answers:
morpeh [17]2 years ago
8 0

Answer:

Step-by-step explanation:

5x - 2 = 55

5x = 57

x = 57/5

anzhelika [568]2 years ago
4 0

Answer:

5x - 2 = 55 \\ 5x = 55  + 2 \\ 5x = 57 \\ x =  \frac{57}{2}  \\ x = 28.5

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Factor an expression:<br>(x²+x+1)²+3x(x²+x+1)-18x²​
Ivahew [28]

Answer:

x^4 + 5x^3 - 12x^2 + 5x + 1

3 0
3 years ago
Read 2 more answers
Solve the system of equations using multiplication. 3x – 3y = –3 5x – y = –13 What is the solution of the system?
love history [14]

ANSWER

The solution is

x=-3,y=-2

EXPLANATION

First equation

3x – 3y = –3

Second Equation:

5x – y = –13

Multiply the second equation by 3 to get:

Third equation:

15x-3y=-39

Subtract the first equation from the third equation:

15x - 3x =  - 39 -  - 3

12x =  - 36

Divide both sides by 12,

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Put x=-3 into the first equation:

3( - 3) - 3y =  - 3

- 9  - 3y =  - 3

Group like terms,

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y =  - 2

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x=-3,y=-2

6 0
3 years ago
The scale of a model is 0.5in : 6 ft. find the length of the model for an actual length of 204 ft
NNADVOKAT [17]

Answer:

17 in

Step-by-step explanation:

.5 in : 6 ft

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8 0
2 years ago
Don't get this
kap26 [50]
I'll talk you through it so you can see why it's true, and then
you can set up the 2-column proof on your own:

Look at the two pointy triangles, hanging down like moth-wings
on each side of 'OC'.

-- Their long sides are equal,  OA = OB, because both of those lines
are radii of the big circle.

-- Their short sides are equal, OC = OC, because they're both the same line.

-- The angle between their long side and short side ... the two angles up at 'O',
are equal, because OC is the bisector of the whole angle there.

-- So now you have what I think you call 'SAS' ... two sides and the included angle of one triangle equal to two sides and the included angle of another triangle.
(When I was in high school geometry, this was not called 'SAS' ... the alphabet
did not extend as far as 'S' yet, and we had to call this congruence theorem
"broken arrow".)

These triangles are not congruent the way they are now, because one is
the mirror image of the other one.  But if you folded the paper along 'OC',
or if you cut one triangle out and turn it over, it would exactly lie on top of
the other one, and they would be congruent.

So their angles at 'A' and at 'B' are also equal ... those are the angles that
you need to prove equal.
5 0
3 years ago
Can someone help me quickly with math hw?
Iteru [2.4K]
I need a question to answer first.

8 0
3 years ago
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