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Chapter 7: Q. 382 (page 737)
Simplify
Simplified answer is
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Mike, an experienced bricklayer, can build a wall in 3 hours, while his son, who is learning, can do the job in 6 hours. How long does it take for them to build a wall together?
Paul, a dentist, determined that the number of cavities that develops in his patient鈥檚 mouth each year varies inversely to the number of minutes spent brushing each night. His patient, Lori, had four cavities when brushing her teeth 30 seconds (0.5 minutes) each night.
a) Write the equation that relates the number of cavities to the time spent brushing.
b) How many cavities would Paul expect Lori to have if she had brushed her teeth for 2 minutes each night?
Curtis was training for a triathlon. He ran kilometers and biked kilometers in a total of hours. His running speed was kilometers per hour less than his biking speed.
What was his running speed?
Nancy took a 3-hour drive. She went 50 miles before she got caught in a storm. Then she drove 68 miles at 9 mph less than she had driven when the weather was good. What was her speed driving in the storm?
The maximum load a beam will support varies directly with the square of the diagonal of the beam's cross section. A beam with diagonal 6 inch will support a maximum load of 108 pounds.
a. Write the equation that relates the load to the diagonal of the cross section.
b. What load will a beam with a 10-inch diagonal support?
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