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Gemiola [76]
2 years ago
6

Cho Q(x)=x^2+mx-12.Biết Q(-3)=0.tìm nghiệm còn lại

Mathematics
1 answer:
Pachacha [2.7K]2 years ago
3 0

Answer: m=-1.

Step-by-step explanation:

Q(x)=x^2+mx-12\ \ \ \ Q(-3)=0\ \ \ \ \ m=?\\Q(-3)=(-3)^2+m*(-3)-12=0\\9-3m-12=0\\-3m-3=0\\3m=-3\ |:3\\m=-1.

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The formula for the lateral surface area of a cylinder is S = 2trh , where r is the radius of the
r-ruslan [8.4K]

\boxed{r=\frac{S}{2\pi h}}

<h2>Explanation:</h2>

Remember you have two write complete questions in order to get good and exact answers. Here I'll assume you want to isolate the radius (r). So:

The formula for the lateral surface area of a cylinder is:

S=2\pi rh \\ \\ \\ Where: \\ \\ S:Lateral \ surface \ area: \\ \\ r:Radius \\ \\ h:Height[tex][tex]Dividing \ both \ sides \ by \ 2\pi h: \\ \\ S=2\pi rh \\ \\ \frac{S}{2\pi h}=\frac{2\pi rh}{2\pi h} \\ \\ \\ Finally: \\ \\ \boxed{r=\frac{S}{2\pi h}}

<h2>Learn more:</h2>

Cylinder: brainly.com/question/12248187

#LearnWithBrainly

5 0
3 years ago
The function h is defined by h (x) = x^2 +5.<br> Find h (4a).<br> ????
rjkz [21]

Answer:

16a^2+5

Step-by-step explanation:

8 0
4 years ago
Bob and Ted are in the plumbing business. Bob can do the plumbing hook-up for a new house in 4 hours; Ted does the same job in 6
Lerok [7]

Answer:

5 Hours

Step-by-step explanation:

Bob needs atleast 4 hours to do his work

Ted needs atleast 6 hours

Bob is going to help ted speed up a little

2.4 and 2.1 are to fast because bib needs 4 hours and ted needs 6 so the meet in the middle and get 5.

Hope this helps!

4 0
2 years ago
Oil that costs 22.50/barrel is mixed with oil that costs 35.00/barrel. How many barrels of each oil should be included in 1250 b
timama [110]
So 22.5 per barrel



so 22.5
x represents the number of 22.5 barrels

y represents the number of 35 barrels

so
x+y=1250

then find the total cost
1250 barrels
27.5 per so mutiply by 1250 and get 34375 total cost

22.5x+35y=34375

we have 2 senctances
x+y=1250
22.5x+35y=34375

elimination
mulitply first equation by -35 to clear y
-35x-35y=-43750
add to second equation
-35x-35y=-43750
<u>22.5x+35y=34375    +</u>
-12.5x+0y=-9375
-12.5x=-9375
multiply -1
12.5x=9375
divie both sides by 12.5
x=750


subsitute
x+y=1250
750+y=1250
subtract 750
y=500


750 barrells of the 22.5 oil should be included and
500 barrells of the 35 oil should be included

4 0
3 years ago
3 over 15 equals 12 over 60
adelina 88 [10]
3/15 = 1/5
12/60 = 1/5

So the answer is true
3 over 15 equal 12 over 60

Hope I can help you :)
5 0
4 years ago
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