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A multiple-choice exam consists of 20 problems, each with five answer choices, exactly one of which is correct. What is the probability that you get at least half of the problems correct if you randomly...

X the average distance from the earth to the moon is 3.844*10^8 meters. if the length of an average pencil is1.8^-1 meters approximately how many pencils would need to be connected together to reach...

A reflector is fastened to the front wheel of a bicycle 20 cm from the center oF the wheel. The diameter of the wheel and inflated tire is 70 cm. If the bike is traveling at 10 km/h, express...

Jeremy is between 20 and 60 years old. If you divide his age by 4, there will be no remainder. Next year you will be able to divide his age by 7 without a remainder. How old is Jeremy now?

candy and tim share a paper route. it takes candy 54 minutes to deliver all of the papers whereas tim takes 108 minutes. how long does it take them when they work together

Curt can be paid in one of two ways for the furniture he sells. Plan A: salary of \$800 per month plus a commission of 10% of sales. Plan B: Salary of \$1200 per month plus a commission of 15% of sales...

A community cent is organizing a dance. There are 4 large columns arranged at the corners of a square. The decorating committee will hang 1 larger streamer from each column to every other column....

Nancy is 5 years younger than her brother Stan. Last year she was twice as young as he was. How old is each of them now? Nancy is ____ Stan is ____ Nancy is 5 years younger than her brother Stan...

a clock chimes on the hour a number of times equal to the hour and also chimes once every quarter hour. if the face of the clock cannot be seen and the clock has just chimed once, what is the longest...