Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $695.80?
A. {x?49 < x < 71}
B. {x?51 < x < 69}
C. {x?50 < x < 48}
D. {x?19 < x < 41}
Answer: A
Mathematics
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Use properties of logarithms to write the expression in terms of logarithms of x, y, z.logb
A. x8z7 - y4b3 B. 8 logbx + 7 logbz - 4 logby + 3 C. logbx8 + logbz7 + logby4 - logbb3 D. 8 logbx + 7 logbz - 4 logby - 3
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Solve.A rock falls from a tower that is 107.8 m high. As it is falling, its height is given by the formula 
How many seconds will it take for the rock to hit the ground (h=0)? Round to the nearest tenth.
A. 2400 sec B. 10.4 sec C. 22.1 sec D. 4.7 sec
Mathematics