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drek231 [11]
3 years ago
11

-4b + 8c + 12 - 8b - 2c + 6. what is the value of the expression when b=2 and c= -3? Enter your answer.

Mathematics
1 answer:
Zarrin [17]3 years ago
7 0

Answer:

The answer is negative 24.

Step-by-step explanation:

(−4)(2)+(8)(−3)+12−(8)(2)+(−2)(−3)+6

=−24

I hope this helps you with your question

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The initial population of a town is 2600, and it grows with a doubling time of 10 years. Determine how long it will take for the
choli [55]

Answer:

It will take the 20 years for the population to quadruple.

Step-by-step explanation:

Exponential population growth:

An exponential model for population growth has the following model:

P(t) = P(0)(1+r)^t

In which P(0) is the initial population and r is the growth rate, as a decimal.

It grows with a doubling time of 10 years.

This means that P(10) = 2P(0). We use this to find r. So

P(t) = P(0)(1+r)^t

2P(0) = P(0)(1+r)^10

(1+r)^10 = 2

\sqrt[10]{(1+r)^10} = \sqrt[10]{2}

1+r = 2^{\frac{1}{10}}

1 + r = 1.0718

So

P(t) = P(0)(1+r)^t

P(t) = P(0)(1.0718)^t

Determine how long it will take for the population to quadruple.

This is t for which P(t) = 4P(0). So

P(t) = P(0)(1.0718)^t

4P(0) = P(0)(1.0718)^t

(1.0718)^t = 4

\log{(1.0718)^t} = \log{4}

t\log{1.0718} = \log{4}

t = \frac{\log{4}}{\log{1.0718}}

t = 20

It will take the 20 years for the population to quadruple.

5 0
3 years ago
Two metal disks, one with radius r = 2. 50 cm and the other with radius r = 5. 00 cm are welded together and
vova2212 [387]

The total moment of inertia of the two disks will be I = 2.375 × 10-³ Kgm² welded together to form one unit.

<h3>What is moment of inertia?</h3>

Moment of inertia is the quantity expressing a body's tendency to resist angular acceleration, which is the sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation.

Using the formulas to calculate the moment of inertia of a solid cylinder:

I = ½MR²

Where;

I = moment (kgm²)

M = mass of object (Kg)

R = radius of object (m)

Total moment of inertia of the two disks is expressed as: I = I(1) + I(2)

That is;

I = ½M1R1 + ½M2R2

According to the provided information;

R1 = 2.50cm = 0.025m

M1 = 0.800kg

R2 = 5.00cm = 0.05m

M2 = 1.70kg

I = (½ × 0.800 × 0.025²) + (½ × 0.05² × 1.70)

I = (½ × 0.0005) + (½ × 0.00425)

I = (0.00025) + (0.002125)

I = 0.002375

I = 2.375 × 10-³ Kgm²

Hence The total moment of inertia of the two disks will be I = 2.375 × 10-³ Kgm² welded together to form one unit.

To know more about moment of inertia follow

brainly.com/question/14460640

#SPJ4

4 0
2 years ago
The Apple Watch was on sale for $474.60. Find the original price of the Apple Watch if it had been reduced by 30%
kondor19780726 [428]

Answer:616.98

Step-by-step explanation:

5 0
3 years ago
What is the value of the dicsriminant of x^2-7x+4?
Aleks [24]

Answer:

33.

Step-by-step explanation:

x^2 - 7x + 4.

The discriminant of the above

= b^2 - 4ac

=  (-7)^2 - 4*1*4

= 49 - 16

= 33.

8 0
3 years ago
Simplify: √27 A. 3√3 B. 9√3 C. 3√9 D. 5√3
blagie [28]
To simplify square root 27, find two numbers that equal 27. But also, one of the numbers should be a perfect square (such as 4, 9, 36...). 

9*3=27. The square root of 9 is 3, which makes it a perfect square. So, the answer is A.
5 0
3 years ago
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