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VLD [36.1K]
3 years ago
11

Solve x2+6x+7=0

Mathematics
2 answers:
Serhud [2]3 years ago
7 0

Answer:

  -3+ √3 or -3- √3

Step-by-step explanation:

Inga [223]3 years ago
7 0
The answer would be -3-√2 and -3+√2
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A 10 cm thick grindstone is initially 200 cm in diameter, and it is wearing away at a rate of LaTeX: 50cm^3/hr. At what rate is
timurjin [86]

Complete question is;

A 10 cm thick grindstone is initially 200 cm in diameter, and it is wearing away at a rate of 50 cm/hr. At what rate is its diameter decreasing?

Answer:

Diameter is decreasing at the rate of 5/(2πr) cm/hr

Step-by-step explanation:

We are told the stone is wearing away at a rate of 50 cm/hr. This means the volume is decreasing. Thus;

dV/dt = -50 cm/hr

Now, a grindstone is in the shape of a cylinder. Thus, volume of grindstone is;

V = πr²h

dV/dr = 2πrh

Now,to find the rate at which the diameter is decreasing, we'll write;

dr/dt = (dV/dt)/(dV/dr)

dr/dt = -50/(2πrh)

We are given;

Diameter = 200 cm

Radius; r = 200/2 = 100 cm

Thickness; h = 10 cm

Thus;

dr/dt = -50/(2π × r × 10)

dr/dt = -5/(2πr) cm/hr

8 0
3 years ago
What is the value of x when y=47 y=0.8x-17 PLS HELP ASAP
prohojiy [21]
Y= 0.8x - 17

x= (y+17)/0.8

substituting y= 47 in the equation

x= (47+17)/0.8
x= 64/0.8

x=80


4 0
4 years ago
Read 2 more answers
Please help with this i will attach photo of figure
Zigmanuir [339]

The variable I=f(w) represents the number of individuals (in thousands) infected w weeks after the epidemic begins.

The value of I=f(2) represents the number of individuals in thousandas infected 2 weeks after the beginning of the epidemic.

From the graph, where I=8, we can conclude that there are 8,000 infected people after 2 weeks of the beginning of the epidemic.

Answer:

f(2) = 8

Means 8,000 people are infected after 2 weeks of the beginning of the epidemic.

8 0
2 years ago
Complete to get an equal ratio<br> 3x/y = ? /2y
amid [387]

Answer:

6x

Step-by-step explanation:

3x/y=x/2y

Since 2y is 2X greater than y, 6x is 2X greater than 3x.

So,

The answer is 6x.

5 0
3 years ago
Which function defines the sequence
lora16 [44]
the answer is An=-4n-2
8 0
3 years ago
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