Solve the problem.The time it takes to complete a certain job varies inversely as the number of people working on that job. If it takes 20 hours for 9 carpenters to frame a house, then how long will it take 30 carpenters to do the same job?
A. 6.0 hr
B. 30 hr
C. 40 hr
D. 13.5 hr
Answer: A
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Evaluate the expression without using a calculator. 128(-1/7)
A. -2
B. 128
C. -128
D. 
E. 
Graph the linear function and give the domain and range.h(x) = 4
A. D = {4}, R = (-?, ?)
B. D = (-?, ?), R = {4}
C. D = {4}, R = (-?, ?)
D. D = (-?, ?), R = {4}
Arrange the polynomial in descending powers of the variable. Then find its degree and leading coefficient.6 - 7x
A. -7x + 6, degree: 2, leading coefficient: -7 B. -7x + 6, degree: 7, leading coefficient: -7 C. -7x + 6, degree: 1, leading coefficient: -7 D. -7x + 6, degree: 0, leading coefficient: 7
The position vector of a particle is r(t). Find the requested vector.The velocity at t = 1 for r(t) = (4t2 + 3t + 7)i - 6t3j + (7 - t2)k
A. v(1) = 7i - 6j - 1k B. v(1) = 11i + 18j + 2k C. v(1) = 5i - 18j - 2k D. v(1) = 11i - 18j - 2k