Question
Question 1 A system of equations: Has two or more equations with the same set of unknowns Has one equation and two unknowns Has two
Question 1
A system of equations:
Has two or more equations with the same set of unknowns
Has one equation and two unknowns
Has two equations with different sets of unknowns
Has more sets of unknowns than equations
Question 2
A system of two linear equations and two unknowns can be solved by:
Elimination
Substitution
Graphing the equations
All of the above
Question 3
A system of two linear equations and three unknowns can be solved by:
Elimination
Substitution
Graphing the equations
It cannot be solved
Question 4
A system of equations has as manyequations as there are variables(unknowns).
True
False
Question 5
Solve these two equations by elimination, substitution or graphing
Equation 1:x+y=1
Equation 2:-2x+4y=6
X=-1/3, y = 4/3
X= 4/3, y = -1/3
X=1/3, y=4/3
X=-4/3, y-=1/3
Question 6
For the following System ofEquations,theMatrixForm included below is correct.
2x+y+z=4
6y+5z=-33x
5y-z=27
Matrix Form:2 1 1 / 4
33 6 5 / 0
0 5 -1 / 27
True
False
Question 7
The cost C (in millions of dollars) of removing p% of the industrial and municipal pollutants discharged into a river is given by
C= 245p/100-p, 0 p < 100
According to this model, explain why or why not it is possible to remove 100% of the pollutants?
Question 8
The admission fee at the county fair is$2for children and$4for adults. On a certain day,2000people enter the fair and$5000is collected. Usingcas the variable to represent the number of children anda as the variable for adults, write system of equations to determine how many children and how many adults attended.Note down this system of equations so that you can use it for the next question.
Question 9
Based on the system of equations you wrote in the previous problem, how many children attended the county fair that day?
Question 10
Evaluate the function (x) = 5x + 4 at (0)
9
1
4
0
Question 11
The profit P (in hundreds of dollars) that a company makes depends on the amount x (in hundreds of dollars) the company spends on advertising according to the model. P(x) = 230 + 40x - 0.5x2What expenditure for advertising will yield a maximum profit?
40
0.5
230
20
Question 12
The concentration C (in mg/dl), of a certain antibiotic in a patient's bloodstream is given by50t/t^2+25where t is the time (in hours) after taking the antibiotic. What is the concentration 10 hours after taking the antibiotic?
Question 13
Write the logarithmic equation in exponential form.
Log216 = 4
Question 14
Find the domain of the function: f(x)=3/x
All real numbers
All real numbers except x=3
All positive real numbers
All real numbers except x=0
Question 15
pHis a measure of the hydrogen ion concentration of a solution. It isdefined as the negative logarithm of the hydrogen ion concentration.The equation is:
pH = - log [H+]
If an acid has anH+concentration of 10-7, find the pH?
Question 16
In order to join a movie streaming service, you pay a $75 annual fee, then $1.50 for each movie you stream. Which equation will allow you todetermine the cost you will pay if you stream x number of movies?
Question 17
Evaluate the function at the indicated value of x.
Function:f(x)=0.5xValue: x = 2
Question 18
Find the domain of the function
f(x)=7/6-x
Domain: all real numbers x except x=7
Domain: all real numbers x except x=6
Domain: all real numbers x
Domain: all real numbers x except x = -6
Question 19
Express the following matrix as a system of equations:
2 3 / 5
-4 7 / 2
Question 20
Solve for x.
4x= 16
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