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Aleks04 [339]
3 years ago
11

Nina can paint two 10 ft. by 12 ft. walls in 3 hours. She has to paint her house, and it has 7 walls this size

Mathematics
1 answer:
suter [353]3 years ago
3 0

Answer:

10.5 hours.

Step-by-step explanation:

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Punctele O, A, B, C sunt coliniare în această ordine, iar segmentele OA, AB și BC au lungimile exprimate în cm, prin numere natu
julia-pushkina [17]

Răspuns:

a) OC = 18cm

b) MN = 6cm

Explicație pas cu pas:

Găsiți diagrama la întrebarea atașată.

a) Din diagramă se poate observa că OC = OA + AB + AC

OC = 2n + 2n + 2 + 2n + 4

OC = 6n + 6

Următorul este să obțineți valoarea lui n:

OM = OA + AM

Să obținem segmentul AM;

Deoarece M este segmentul mijlociu al AC, atunci;

AM = AC / 2

AM = AB + BC / 2

AM = 2n + 2 + 2n + 4/2

AM = 4n + 6/2

AM = 2n + 3

Din moment ce OM = OA + AM

OM = 2n + 2n + 3

OM = 4n + 3

Dat fiind OM = 11

11 = 4n + 3

4n = 11-3

4n = 8

n = 2

Următorul pas este să calculați OC;

OC = 6n + 6

OC = 6 (2) + 6

OC = 18

Prin urmare, lungimea segmentului OC este de 18 cm

b) Această întrebare ne cere să găsim segmentul de linie MN.

Din diagramă, MN = AM - AN

Deoarece AM = 2n + 3 din întrebarea 1;

AM = 2 (2) +3

AM = 4 + 3

AM = 7

Acum, să obținem AN:

Din diagramă, AN = ON-OA și ON = OB / 2

AN = OB / 2 - OA

AN = (2n + 2n + 2) / 2 - 2n

AN = 4n + 2/2 - 2n

AN = 2n + 1 - 2n

AN = 2n-2n + 1

AN = 1

De la MN = AM - AN

MN = 7 - 1

MN = 6cm

Prin urmare, distanța dintre N, mijlocul segmentului OB și punctul M este de 6cm

6 0
4 years ago
Can u do this plz urgent ​
maks197457 [2]

Answer:

1-1) A=6×5=30m² | P=6×2+5×2=12+10=22m

1-2) A=5×20=100mi² | P=5×2+20×2=10+40=50mi

2-1) A=16×6=96m² | P=16×2+6×2=32+12=44m

2-2) A=20×9=180km² | P=20×2+9×2=40+18=58km

3-1) A=14×17=238yd² | P=14×2+17×2=28+34=62yd

3-2) A=20×18=360mi² | 20×2+18×2=40+36=76mi

8 0
3 years ago
Simplify <br><br> (dont mind me just need charactrrs)
siniylev [52]
That is also equal to (9÷1)÷3, so it will be the same as 9÷3. Therefore, the answer is 3.
6 0
3 years ago
Read 2 more answers
Scientific notation of 47300
Reil [10]
4.7 x 10^4
or 5 x 10^4

<span>The scientific notation of 70, 030, 000. To find the scientific notation of this value </span><span><span>
1.  </span>We first move the period which separates the whole number from the decimal number which is located after the numbers of the given value.</span> 
<span><span>2.  </span>We move it in the very recent order number which is seventy million, seven and zero.</span> <span><span>
3.  </span>It becomes 7.003</span>
<span><span>4.  </span>Thus we count how many moves we did from the tens to the ten million order place.</span> <span><span>
5.  </span>7.003 x 10^7 </span>


6 0
3 years ago
What is the greatest common factor of x4 and x3
Dvinal [7]

Answer:

x3

Step-by-step explanation:

Considering x4 and x3 actually power terms.

I mean: x4 is x^{4} and x3 is x^{3}.

Let's decompose the first term: x^{4}=x^{3}.x

Now it is clear that the common factor is x^{3}.

5 0
4 years ago
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