2cos2 t + 3cos t +1 = 0
Find all values of t that satisfy the equation.
Mathematics
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Find the gradient field F of the function f.f(x, y, z) = 
A. F = 
i + 
j + 
k
B. F = - 
i - 
j - 
k
C. F = - 
i - 
j - 
k
D. F = 
i + 
j + 
k
Mathematics
Solve the problem.There are currently 57 million cars in a certain country, increasing exponentially by 0.8% annually. How many years will it take for this country to have 64 million cars? Round to the nearest year.
A. 243 yr B. 14 yr C. 5 yr D. 9 yr
Mathematics
Solve the equation using the quadratic formula. Simplify irrational solutions, if possible.x2 + 7x + 3 = 0
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.What is the domain of the function f(x) = 
?
A. (-?, -9) ? (4, ?) B. [4, ?) C. (-?, -9) ? [4, ?) D. (-?, -9)
Mathematics