15,303 Answered Questions for the topic precalculus

Precalculus

12/06/23

i need help solving this
This exercise uses the exponential growth model.The count in a culture of bacteria was 200 after 2 hours and 12,800 after 6 hours.(a)What is the relative rate of growth of the bacteria population?... more
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Precalculus

12/06/23

i need help solving this
This exercise uses the exponential growth model.Some bullfrogs were introduced into a small pond. The following graph shows the bullfrog population for the next few years. Assume that the... more
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Precalculus

12/06/23

i need help solving this
This exercise uses the exponential growth model.It is observed that a certain bacteria culture has a relative growth rate of 15% per hour, but in the presence of an antibiotic the relative growth... more
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12/06/23

Do you provide examples of problems and work them?
If I needed extra examples and scenarios worked to fully understand a concept, do you provide examples like that?
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Precalculus

12/05/23

The​ half-life of a certain substance is 30 years. How long will it take for a sample of this substance to decay to ​80% of its original​ amount?
Need some help lol
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Precalculus

12/05/23

ind the angle 𝜃 (in degrees) between the vectors. (Round your answer to two decimal places.)
u= 3i + 4jv= -7i + 5j𝜃 =
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Precalculus

12/05/23

Solve the system by the method of elimination. (If there is no solution, enter NO SOLUTION. If the system is dependent, enter a for x and enter y in terms of a.)
25x - 5y = -15-5x + y = 3 (x,y)=
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Precalculus

12/05/23

Find the angle 𝜃 (in radians) between the vectors.
u= cos(pi/3)i + sin(pi/3)jv= cos(3pi/4)i + sin(3pi/4)j𝜃 = 
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Precalculus

12/05/23

The initial and terminal points of a vector are given. Write the vector as a linear combination of the standard unit vectors i and j.
initial point: (-2,1)terminal point: (5,-5)
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Precalculus

12/04/23

how do i find matrices?
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Precalculus

12/04/23

How do I find B?
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Precalculus

12/04/23

What equations do i uue for this?
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Precalculus

12/04/23

what is cramer's rule and how do i apply it?
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Precalculus

12/04/23

how do i find the value?
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Precalculus

12/04/23

what is gaussian elimination method
Use the Gaussian elimination method to solve the system of linear equations. If the system has infinitely many​ solutions, write the solution set with z arbitrary.x + 2y + 2z =2-x + 3y + 5z =1x + y... more
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Precalculus

12/04/23

What is the Gauss-jordan method?
Use the​ Gauss-Jordan method to solve the system of equations. If the system has infinitely many​ solutions, give the solution with z arbitrary.4x+2y-3z+6=02x-y+2z-6=0-8x-4y+6z=0
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Precalculus

12/04/23

What is the equation of the circle? How would i find it?
Given three noncollinear​ points, there is one and only one circle that passes through them. Knowing that the equation of a circle may be written in the following​ form, find the equation of the... more
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Precalculus

12/04/23

Solve the system by elimination.
3x+4y=76x-7y=44
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Precalculus Algebra 2 Calculus

12/04/23

An unknown radioactive element decays into non-radioactive substances. In 880 days the radioactivity of a sample decreases by 36 percent.

(a) What is the half-life of the element? half-life:     (days) (b) How long will it take for a sample of 100 mg to decay to 63 mg? time needed:    (days) 
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Precalculus

12/03/23

Use the vector u = 6, 6 to find the indicated quantity.

u · u
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Precalculus

12/03/23

Find u · v u = i − 8j v = −2i + j
u = i − 8jv = −2i+ j
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Precalculus

12/02/23

Complex Numbers
Write the complex number in polar form with argument 𝜃 between 0 and 2𝜋.6 + 6i
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Precalculus Calculus

12/02/23

What was the initial population at time t=0?  Find the size of the bacterial population after 3 hours. 
The doubling period of a bacterial population is  10 minutes. At time t=90 minutes, the bacterial population was 60000.What was the initial population at time t=0?    Find the size of the bacterial... more
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Precalculus

12/02/23

Complex Numbers
Explain the difference between rectangular form and polar form of a complex number.Explain why there are two possible distinct results when simplifying (a+bi)^1/2
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Precalculus

12/02/23

Find the magnitude and direction angle of the vector v.
v = 9i − 9j
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