Solve the problem.Martha can rake the leaves in her yard in 5 hours. Her brother can do the job in 4 hours. How long will it take them to do the job working together?
A. 
hr
B. 
hr
C. 20 hr
D. 
hr
Answer: D
Mathematics
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Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.10x = 2.92
A. 1.07 B. 0.47 C. 831.76 D. 29.2
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Multiply the expressions.(r - 10)2
A. 100r2 - 20r + 100 B. r2 + 100 C. r2 - 20r + 100 D. r + 100
Mathematics
Factor completely. If the polynomial is prime, state this.-36 + t2
A. (t2 + 6)(t2 - 6) B. (t + 36)(t - 36) C. (t - 6)2 D. (t + 6)(t - 6)
Mathematics
Solve the equation. Use words or set notation to identify equations that have no solution, or equations that are true for all real numbers. 2(x + 7) + 102 = 6x - 4(x - 8)
A. ? B. {70} C. {x|x is a real number} D. {134}
Mathematics