Solve the problem.Martha can rake the leaves in her yard in 2 hours. Her younger brother can do the job in 3 hours. How long will it take them to do the job if they work together?
A. 6 hr
B. 
hr
C. 
hr
D. 3 hr
Answer: C
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Identify a technique of integration for evaluating the integral. If necessary, explain how to first simplify the integrand before applying the suggested technique of integration. You do not need to evaluate the integral.
A. Integrate by parts with u = 1-cot x, dv = csc2x dx B. Integrate by parts with u = csc2x, dv = (1 - cot x) dx C. Substitute, letting u = 1-cot x D. Substitute, letting u = csc2x
Find the equation of the parabola satisfying the given conditions. The vertex is at the origin.Directrix y = -2.6
A. x2 = 10.4y B. y2 = 10.4x C. x2 = -10.4y D. y2 = -10.4x
Indicate whether the variable is qualitative or quantitative.The colors of book covers on a bookshelf
A. qualitative B. quantitative
Find any values of the variables that must be excluded.
A. a = 8 B. a = 8, a = 4 C. a = -8 D. Defined for all real numbers